The percentage by mass of Fe2+ in the tablet is approximately 28.4%.
To calculate the percentage of Fe2+ in the tablet, you will first need to determine the number of moles of Fe2+ present in the 25 cm^3 of solution. This can be done using the balanced equation for the reaction between Fe2+ and K2Cr2O7:
Fe2+ + K2Cr2O7 + H2SO4 → Fe2(SO4)3 + K2SO4 + Cr2(SO4)3 + H2O
From this equation, you can see that for every mole of Fe2+ present in the solution, one mole of K2Cr2O7 is required for complete reaction. Thus, the number of moles of Fe2+ present in the solution can be calculated as follows:
n (Fe2+) = n (K2Cr2O7) = 32.5 cm3 × 0.00160 mol/cm3 = 0.0520 mol
Next, you need to determine the mass of Fe2+ present in the solution. This can be done using the molar mass of Fe2+ (55.85 g/mol) and the number of moles calculated above:
mass (Fe2+) = n (Fe2+) × molar mass (Fe2+) = 0.0520 mol × 55.85 g/mol = 2.9107 g
Finally, you can calculate the percentage by mass of Fe2+ in the tablet as follows:
percentage (Fe2+) = (mass (Fe2+) / mass (tablet)) × 100% = (2.9107 g / 0.940 g) × 100% = approximately 28.4%.
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*Part A is already answered but I'm still putting it in the question because it relates to part b*
PART A
State the law of conservation of energy
- In an energy exchange, energy is transferred between the system and the surroundings.
- If the system loses energy, the surroundings gain energy, and vice versa.
- Energy can be transferred from one object to another.
- The law of conservation of energy states that energy can be neither created nor destroyed.
- Energy can assume different forms.
PART B (what i need answered)
Explain its significance.
Check all that apply.
- In chemical and physical changes, matter often exchanges energy with its surroundings.
- In the exchanges, the total energy is always conserved; energy is neither created nor destroyed.
- In chemical and physical changes, matter never exchanges energy with its surroundings.
- Systems with high potential energy tend to change in the direction of lower potential energy, releasing energy into the surroundings.
- Systems with high potential energy tend to change in the direction of lower potential energy, obtaining energy from another objects.
- In the exchanges, the total energy is always changed; energy is created and destroyed.
Energy is exchanged between a system and its surroundings during an energy exchange. The environment gains energy while the system cools down, and vice versa.
Describe energy?
People have figured out how to transform energy from one type to the another and then utilize it to accomplish tasks, making modern civilization possible.The capacity to exert an force that causes an item to move is what is meant by the.
Describe potential?
The amount of energy and potential at a specific location is known as the electric potential.Potential is the possibility of achieving something, usually in terms of success, power, or status. Potential often refers to the untapped potential that exists within any situation or individual, and can be unlocked through hard work, dedication, and perseverance. Potential can also refer to the ability of something to develop or become more successful in the future.
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determine the ph of the solution resulting when 100 cm3 of 0.50 mol dm–3 hcl(aq) is mixed with 200 cm3 of 0.10 mol dm–3 naoh(aq).
Answer:
The pH of the solution resulting from mixing 100 cm3 of 0.50 mol dm–3 HCl(aq) with 200 cm3 of 0.10 mol dm–3 NaOH(aq) is 12.2, calculated using the formula pH = -log[H+], where [H+] is the concentration of hydrogen ions in the solution.
Explanation:
jill creates a standard curve of mass vs volume for a series of solutions. her curve is shown below. she is provided with a solution of unknown concentration (mass %). if the density of the unknown solution is 1.221 g/ml, what is the concentration of the solution, expressed as mass %? provide a numerical response, without units, to 3 digits after the decimal.
Answer:
m sorry, I cannot provide a numerical response for this question because the information provided does not include a standard curve of mass vs volume for a series of solutions, it is not possible to determine the concentration of an unknown solution from the information given. In order to determine the concentration, we would need a graph with known mass and volume data points, as well as the equation of the line that fits the data points. Then we would use the density of the unknown solution and the volume to solve for mass, then use the mass and volume to determine the concentration of the unknown solution.
at low temperature in a polycrystalline metal, the electron scattering length can sometimes be approximated by the crystal grain size. a. for silver at room temperature, what is the critical grain size where this effect becomes important? b. what is the critical grain size at 500 oc?
At low temperature in a polycrystalline metal, the electron scattering length can sometimes be approximated by the crystal grain size. a. for silver at room temperature, what is the critical grain size where this effect becomes important? b. what is the critical grain size at 500 oc?
a. The critical grain size at room temperature (approximately 20°C) for silver where the electron scattering length can be approximated by the crystal grain size is not a well-defined value and can vary based on various factors such as the purity and crystal structure of the metal.
b. The critical grain size at 500°C for silver where the electron scattering length can be approximated by the crystal grain size is also not a well-defined value and would depend on various factors such as the purity and crystal structure of the metal. Additionally, the temperature may affect the electron scattering length and grain size, making it difficult to accurately predict the critical grain size.
About temperature changesTemperature, or temperature is a measure of the level or degree of heat on an object. Temperature shows the level of the amount of heat energy that is in the object.
Discussion:
The higher the temperature of an object, the hotter it is, and the more heat energy is in that object. The tool for measuring temperature is a thermometer.
For example, hot water has more heat energy than cold ice.
Temperature is one of the basic quantities, which cannot be derived from other quantities. Temperature is measured in Kelvin (in the International System), but in everyday use the most common measurement is degrees Celsius (°C). For example, the temperature of freezing water is 0°C, the temperature of the human body is about 37.5°C and the temperature of boiling water is about 100°C.
The Kelvin scale has many scientific uses, such as calculating temperature and its change in an ideal gas. The kelvin is the SI unit for temperature, where 0 K is absolute zero (at which there is no movement of particles, which is equivalent to -273 °C.
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all of the following are elements of the fraud triangle except group of answer choices perceived confidentiality perceived pressure rationalization perceived opportunity
The fraud triangle includes all of the following EXCEPT validation
Fraud is an activity that is conducted in order for someone to gain from it. It usually involves money. When committed as part of someone's job, it can result in immediate termination.
The fraud triangle outlines three conditions that lead to higher instances of occupational fraud: motivation, opportunity, and rationalization
The fraud triangle developed by Cressey in 1953 is model for explaining factors that cause someone to commit occupational fraud. It consists of three components which, together, lead to fraudulent behavior: Perceived unshareable financial need, Perceived opportunity and Rationalization
Here are a few examples of fraud opportunities: Lying about number of hours worked, their sales numbers, or their productivity to receive higher pay. Creating false invoices for products the company never purchased and pocketing money. Selling proprietary company information to the competitors.
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(e) Consider three identical flasks filled with
different gases.
Consider three identical flasks filled with different gases.
Flask A: Carbon monoxide at 855 torr and 5°C.
Flask B: Nitrogen at 320 torr and 5°C.
Flask C: Hydrogen at 205 torr and 5°C.
(i) In which flask will the molecules have the
greatest average kinetic energy?
(ii) In which flask will the molecules have the
greatest average velocity?
The flask in which the molecules will have the greatest average velocity is Flask A which contains Carbon monoxide at 855 torrs and 5°C.
The correct option is A.
What is the effect of temperature and pressure on the average velocity of gases?The average velocity of gases is directly proportional to the pressure and temperature of gases.
This means that the greater the pressure of the gases, the greater will be the average velocity of the gases.
Also, the greater the temperature of the gases, the greater will be the average velocity of the gases.
Flask A contains gas at the highest pressure.
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why is carbon special?
-4 unpaired electrons = up to 4 different atomic partners
-can form single bonds with H
-can form single and double bonds with O and N
-can single, double, and triple bond with itself
Carbon is special because it has four unpaired electrons, can form single bonds with H, can form single and double bonds with O and N, can single, double, and triple bond with itself.
First, carbon has four unpaired electrons in its outer shell, which allows it to form up to four different chemical bonds with other atoms. This allows carbon to form complex molecular structures with a variety of other elements, including hydrogen, oxygen, nitrogen, and even other carbon atoms.
Second, carbon can form single bonds with hydrogen, which allows it to form the backbone of many organic molecules. This single bonding capability also allows it to form single bonds with oxygen and nitrogen, which are essential components of many biological molecules, such as amino acids, carbohydrates, and nucleotides.
Finally, carbon can also form double and triple bonds with itself, which provides an additional level of chemical versatility. These double and triple bonds between carbon atoms allow for the formation of molecules with diverse properties, such as rigidity and reactivity, and they play a key role in the formation of important molecules like alkanes, alkenes, and alkynes.
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why does the change for the atomic radii of the elements in period 3 from sodium to argon look similar to period 2
The change in the atomic radii of the elements in period 3 from sodium to argon is similar to period 2 because the number of protons of the elements is getting bigger to the right, so the radius of the elements from left to right is decreasing.
Third Period Elemental PropertiesThe number of elemental protons to the right, the greater. The greater the number of protons, the stronger the attraction for the nucleus, so that the radius of the elements from left to right decreases. Because the attraction to the core is getting stronger to the right, the electrons are also getting stronger attracted inward, so that the valence electrons of the third period elements, the further to the right the less.
The shorter the radius, the closer the electrons are to the nucleus and the harder it is to escape. That is, the smaller the radius, the greater the ionization energy required.
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550 mL of gas at I atm is expanded to 960 mL. What will the pressure be?
Answer: If 550 ml of gas at 1 atm expands to 960 ml, the pressure will be 0.57 atm.
Explanation:
It is an exercise of Boyle's Law that says: "At constant temperature the volume of a mass of a gas is inversely proportional to the pressure it exerts".
This means that if the volume is doubled the pressure is halved, and if the pressure is increased three times as much, the volume will be one third (1/3) of what it originally was.
The word inversely proportional means that if the pressure increases the volume decreases but proportionally.
550 mL of gas at I atm is expanded to 960 mL. What will the pressure be?
Data:
V₁ = 550 mL
P₁ = 1 atm
V₂ = 960 mL
P₂ = ?
The formula of this law is:
P₁V₁ = P₂V₂Where
P₁ = Initial pressureV₁ = Initial volumeP₂ = Final pressureV₂ = Final volumeHe asks us what the pressure would be after 960 mL, we solve the formula for the final pressure, then
[tex]\boxed{\bold{P_1V_1=P_2V_2 \iff \ P_2=\frac{P_1V_1}{V_2} }}[/tex]
We substitute our data in the cleared formula and solve:
[tex]\boxed{\bf{P_2=\dfrac{(1 \ atm \ \times \ 550\not{mL}) }{960\not{mL}} }}[/tex]
[tex]\boxed{\bf{P_2=0.57 \ atm }}[/tex]
If 550 ml of gas at 1 atm expands to 960 ml, the pressure will be 0.57 atm.
in a first-order decomposition reaction, 50.0% of a compound decomposes in 19.0 min. (a) what is the rate constant of the reaction? (round to four decimal places)
The rate constant of the reaction is [tex]0.0369 min^{-1}[/tex], where 50.0% of a compound decomposes in 19.0 min.
In a first-order decomposition reaction, the rate of reaction is proportional to the concentration of the reactant. The rate constant, k, describes the rate of the reaction and is related to the half-life of the reaction, t1/2, by the equation:
t1/2 = 0.693/k.
In this case, since 50.0% of the compound decomposes in 19.0 min, the half-life of the reaction can be calculated as follows:
t1/2 = 19.0 min * (1 - 0.50)^(1/2) = 13.5 min.
The rate constant can then be calculated using the equation:
k = 0.693/t1/2 = [tex]0.0369 min^{-1}[/tex].
This value of k can be used to predict the rate of reaction at any time during the decomposition, as well as to compare the rate of the reaction to other first-order decomposition reactions.
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share one occasion in which you exhibited any of the reasoning biases or heuristics covered in this week’s zaps lab
Answer:
Heuristics are the "shortcuts" that humans use to reduce task complexity in judgment and choice, and biases are the resulting gaps between normative behavior and the heuristically determined behavior (Kahneman et al., 1982).
The availability heuristic works by prioritizing infrequent events based on recency and vividness. For example, plane crashes can make people afraid of flying. However, the likelihood of dying in a car accident is far higher than dying as a passenger on an airplane.
The three heuristics that received most attention were availability, representativeness, and anchoring and adjustment. The availability heuristic refers to the tendency to assess the probability of an event based on the ease with which instances of that event come to mind.
Heuristics are mental shortcuts that allow people to solve problems and make judgments quickly and efficiently. These rule-of-thumb strategies shorten decision-making time and allow people to function without constantly stopping to think about their next course of action.
While the deodorant example is obviously simple, biases and heuristics play a role in almost all decisions we make. Choices about who to hire, how to invest in the stock market, and when to seek medical care when something ails us are examples of more important decisions that are all influenced by biases and heuristics.
Biases can occur due to various reasons, with the most common causes being: Heuristics. These are biases that are caused by our use of mental shortcuts. Limited cognitive capacity. These are biases that are caused by our limited cognitive capacity. Noisy information processing.
Heuristics help make life easier and allow us to make quick decisions that are usually pretty accurate. Being aware of how these heuristics work as well as the potential biases they introduce might help you make better and more accurate decisions.
Another cognitive bias that has its roots in the availability heuristic is known as the optimism bias. Essentially, we tend to be too optimistic for our own good. We overestimate the likelihood that good things will happen to us while underestimating the probability that negative events will impact our lives.
Explanation:
why sahlis method most frequently employed as routines test
The fundamental idea behind Sahli's acid haematin technique is that hemoglobin is changed into acid haematin by the action of HCl, which results in a brown color.
The International Committee for Standardization in Haematology recommends the direct cyanmethaemoglobin method2 as the method that is most frequently used to estimate hemoglobin quantitatively. It is comparatively easy and inexpensive, because it involves the creation of cyanmethaemoglobin, a stable compound3. Blood's hemoglobin content can be found out using Sahli's method. The haemoglobin content of blood samples is determined using Sahli's haemoglobinometer by converting hemoglobin to hematin acid, which is then diluted to produce hematin acid that matches the comparator's color.
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1.
When 1• 50g of ethanol
was
apparatus 500g of water.
vapour
20°C to 39-5°C
enthalpy of compustion of
combustion
raised the temp forom
the
Calculate
ethanol
the
The heat that has been taken in by the water is 40.2 kJ.
What is the heat of combustion of the water?We know that when we heat the water the water would be turned from liquid to the vapor state . As such we are interested in the heat that would be evolved when this process would be taking place and we can be ale to write that;
H = mcdT
H = heat that have been evolved or absorbed
m = mass of the water
c = Heat capacity of the water
dT = The temperature change of the water.
As such, we have that;
H = 500 * 4.12 * (39.5 - 20)
H = 40.2 kJ
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A force can act directly on an object . . .?
which component of the heat of solution will always be negative? select the correct answer below: heat of solute heat of solvent heat of mixing none of the above
The heat of solute will always be negative in exothermic dissolution. Option A, is correct
The heat of solution, also known as the enthalpy of solution, is the change in enthalpy that occurs when a solute is dissolved in a solvent to form a solution. The heat of solution is a combination of three components: heat of solute, heat of solvent, and heat of mixing.
The heat of solute is always negative for exothermic dissolution, meaning that the solute releases heat as it dissolves. The heat of solvent can be positive or negative, depending on whether the solvent absorbs or releases heat during the dissolution process. The heat of mixing is also positive or negative, depending on whether the mixing of the solute and solvent results in a positive or negative change in enthalpy.
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--The given question is incomplete, the complete question is
"which component of the heat of solution will always be negative? select the correct answer below: A) heat of solute B) heat of solvent C) heat of mixing D) none of the above."--
lf we start with a pure substance (2-bromo-2-methylpropane bp 72 C) what will happen to the boiling point if we repeat several trials with the same sample? Will it go up, down or stay the same? Why?
If multiple tests are conducted with the same sample, the boiling point of a pure chemical (2-bromo-2-methylpropane) should remain constant.
The intermolecular forces in a substance control its boiling point, which is a physical characteristic that never changes. If multiple tests are conducted with the same sample, the boiling point of a pure chemical (2-bromo-2-methylpropane) should remain constant. The intermolecular forces in a substance control its boiling point, which is a physical characteristic that never changes. The boiling point should not change as long as the sample is unaltered and pure. When a non-volatile solute is introduced to a solvent, boiling point elevation happens, raising the boiling point of the resulting mixture.
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a sodium hypochlorite feed pump (hypochlorinator) is not feeding the proper amount. the residual has steadily decreased over the last few days. what is the possible cause?
The possible cause for a sodium hypochlorite pump not feeding the proper amount and resulting in a decrease in residual could be: Clogged feed lines, Worn or damaged pump components, Incorrectly set feed rate or Electrical or mechanical failure of the pump.
It is recommended to check and correct these issues to ensure proper operation of the sodium hypochlorite feed pump. These include clogged feed lines, worn or damaged pump components, an incorrectly set feed rate, or electrical or mechanical failure of the pump.
It is important to identify and address the underlying cause in order to ensure proper operation and reliable performance of the pump. Professional inspection and maintenance of the system may be necessary in order to resolve the issue and prevent future problems.
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A students has 1.70 moles of manganese. How many grams of manganese do they have
The number of grams in 1.70 moles of manganese is 93.5grams.
How to calculate mass?The mass of a substance can be calculated by multiplying the number of moles in the substance by its molar mass as follows:
mass = molar mass × no of moles
According to this question, a student has 1.70 moles of manganese. The number of grams of manganese that they have can be calculated as follows:
molar mass of Manganese = 55g/mol
mass = 1.70 × 55
mass = 93.5g
Therefore, 93.5grams is the mass of manganese
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An element has an atomic number 17.How many electrons are present in K,L and M shells of the atom?
Answer:
k=2, L=8, M=7
Explanation:
because k shell have maximum electron number of 2 ,L shell and M shell have 8 and 18 respectively.
write the structure of the major organic products formed in the reaction of ozonide with dimethyl sulfide (ch3)2s.
The following are the primary organic compounds generated by the reaction of ozonide with dimethyl sulphide (CH3)2S: (CH3)2SO dimethyl sulfoxide, and (CH3)2SO2 dimethyl sulfone.
When ozonide reacts with dimethyl sulphide (CH3)2S, two main organic products are formed: methyl sulfoxide (CH3SO) and dimethyl sulfoxide (CH3)2SO.
To generate the end products, the sulphide sulphur atom is nucleophilically added to the ozonide intermediate, followed by the migration of a methyl group and a proton shift.
These organic products' structures can be written as follows:
CH3SO (methyl sulfoxide): CH3-S-O
CH3-S(=O) dimethyl sulfoxide (CH3)2SO-CH3
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What are the 7 natures of science?
The nature of science (NOS) is a crucial part of scientific literacy that improves students' comprehension of scientific ideas and empowers them to make rational decisions about personally and socially relevant scientific concerns.
What are the different natures of science?A specific method of comprehending the natural world is through science. It broadens the innate curiosity we all possess at birth. One may easily tell science apart from non-science by having a basic understanding of how it operates.
Derek Hodson, a scientist and scientific educator, likens the process of teaching science to that of an anthropological imparting knowledge about a different culture.
Therefore, Both can be seen of as involving a tribe of individuals who have a certain body of knowledge, a particular language, customs, rituals, traditions, attitudes, and values.
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The nature of science (NOS) is a crucial part of scientific literacy that improves students' comprehension of scientific ideas and empowers them to make rational decisions about personally and socially relevant scientific concerns.
What are the different natures of science?A specific method of comprehending the natural world is through science. It broadens the innate curiosity we all possess at birth. One may easily tell science apart from non-science by having a basic understanding of how it operates.
Derek Hodson, a scientist and scientific educator, likens the process of teaching science to that of an anthropological imparting knowledge about a different culture.
Therefore, Both can be seen of as involving a tribe of individuals who have a certain body of knowledge, a particular language, customs, rituals, traditions, attitudes, and values.
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at what temperature would a 0.291 m solution of magnesium sulfate (mgso₄) in water exhibit an osmotic pressure of 14.0 atm? assume magnesium sulfate completely dissociates. r = 0.08206 l･atm/k･mol
31.25 °C is the temperature at which a 0.291 m solution of magnesium sulfate in water exhibit an osmotic pressure of 14.0 atm.
The physical concept of temperature indicates in numerical form how hot or cold something is. A thermometer is used to determine temperature. Thermometers are calibrated using a variety of temperature scales, which historically defined distinct reference points and thermometric substances. The most popular scales are the Celsius scale, sometimes known as centigrade, with the unit symbol °C, the Fahrenheit scale (°F), and the Kelvin scale (K), with the latter being mostly used for scientific purposes. One of the International System of Units' (SI) seven base units is the kelvin.
π = MRT
14.0 atm = M(0.08206 L·atm/K·mol)T
M = 214.5/T
0.291 L = moles of solute / 1 L
moles of solute = 0.291 M
moles of [tex]Mg^2+[/tex] = 2 x moles of MgSO[tex]_4[/tex]= 2 x 0.291 M = 0.582 M
Π = iMRT
Π = 3 x 0.582 M x (0.08206 L·atm/K·mol) x T
14.0 atm = 0.448 Atm·K·mol/L x T
T = 31.25 °C
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calcium oxide and water are produced by heating calcium hydroxide. if the reaction has an expected yield of 60%, how much calcium hydroxide should be reacted to produce 115g of calcium oxide?
To produce 115g of calcium oxide with an expected yield of 60%, you would need to react 192.5g of calcium hydroxide. This can be calculated by multiplying the desired amount of calcium oxide (115g) by 100 and then dividing by the expected yield (60%).
Calcium oxide, also known as lime or quicklime, is a white alkaline solid produced when calcium carbonate is heated to a high temperature. It is used in a variety of industrial and manufacturing processes, including cement production, steel production, and water treatment.
Calcium oxide is also used in the production of calcium hydroxide, which is used in paper production and as a soil amendment.
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a solution of cacl2 in water forms a mixture that is 28.0alcium chloride by mass. if the total mass of the mixture is 574.2 g, what masses of cacl2 and water were used?
The solution of CaCl₂ in water forms the mixture that contains 28 % of calcium chloride by the mass. If the total mass of the mixture is 574.2 g, the masses of CaCl₂ 161.17 and the water used is 413 g.
The mass percent = (Mass of CaCl₂ / (mass of CaCl₂ + mass of H₂O)) × 100%
28 % = (Mass of CaCl₂ / (mass of CaCl₂ + mass of H₂O)) × 100%
The total mass of the mixture = 574.2 g
Mass of CaCl₂ + mass of H₂O = 574.2 g
By solving the formula, we get :
Mass of CaCl₂ = (28/100) × (mass of CaCl₂ + mass of H₂O)
Mass of the CaCl₂ = = (28/100) × 574.2 g
Mass of CaCl₂ = 161.17 g
The mass of the water, H₂O = 574.2g - 161.176g
= 413 g
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which of the following is not considered a safety hazard in the laboratory? carrying out a reaction in the fume hood because the reaction generates flammable or toxic gases. storing your backpack on the floor next to your lab bench. disposing of excess acid in the organic waste carboy. pointing the open end of a test tube or flask at yourself or your neighbor. eating or drinking in the laboratory.
Eating or drinking in the laboratory is not considered a safety hazard in the laboratory.
It is important to take safety precautions while working in a laboratory and to always follow the safety protocols in place.
It is important to be aware of the potential hazards in any laboratory environment. Always wear protective clothing such as lab coats, safety glasses, and protective gloves when working with hazardous chemicals or materials. It is also important to be aware of the safety protocols in place for specific experiments, and to follow the instructions provided.
Additionally, it is important to be aware of the potential risks associated with using and storing flammable chemicals, as well as the potential risks associated with using open flames or working with hazardous biological agents. Finally, it is important to ensure that all waste products are handled and disposed of safely.
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According to Le Chatelier' principle, if a ytem in dynamic equilibrium contain a large exce of reactant, what can be done to encourage the formation of more product?
According to Le Chatelier' principle, if a ytem in dynamic equilibrium contain a large excess of reactant, to encourage the formation of more product we can remove product from the system as it is formed.
A system in dynamic equilibrium will respond to a stress (change in conditions) in a way intended to reduce that stress. This is the guiding idea of Le Chatelier.
We want to influence the system's response so that it produces more product. A reduction in product results from adding stress to the system by removing some of the product. The system's response is to move the equilibrium to the right to boost product production in order to reduce the stress.
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Which is one characteristic of some pure substances?
They contain different types of molecules.
They can be homogeneous or heterogeneous.
Only elements are pure substances.
They cannot be changed into simpler substances.
Answer:
Only elements are pure substances.
Answer: c
Explanation:
is it possible to calculate the heat of sublimation for a substance given its heats of vaporization and fusion? if so, what is the relationship?
Yes, it is possible to calculate the heat of sublimation for a substance if its heats of vaporization and heats of fusion are given.
The molar heat (or enthalpy) of sublimation is defined as the amount of energy that must be added to a mole of solid at constant pressure to turn it directly into a gas (without passing through the liquid phase).
Sublimation requires all the forces which breaks all types of bonds between the molecules (or other species, such as ions) in the solid as the solid is converted into a gas. The heat of sublimation is basically expressed as ΔHsub in units of Joules per mole or kilogram of substance.
The relation between heat of sublimation, heats of vaporization and heats of fusion is given as,
ΔHsub = ΔHfus + ΔHvap
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what is the most likely molecular formula for the compound represented in the above mass spectrum? be sure to use subscripts when writing the formula.
C₆H₁₂O₆ is the most likely molecular formula for the substance shown in the given mass spectrum picture (See Picture 3).
This is because the mass spectrum shows that the peak with the highest abundance happens at a m/z value of 180, which is the same as the molecular mass. of C₆H₁₂O₆.
Half the molecular mass, or the m/z value of 90, corresponds to the second-most prevalent peak. Given that carbohydrates often have molecular formulae that are a multiple of C₆H₁₂O₆, this shows that the molecule in question is most likely a carbohydrate.
Furthermore, the existence of a fragment signal at m/z 162 indicates that the molecule has an additional oxygen atom over that is C₆H₁₂O₆. This is consistent with the molecule being a carbohydrate because these molecules frequently have an extra oxygen atom.
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The complete question is:
What is the most likely molecular formula for the compound represented in the above mass spectrum (See picture 3)? Subscripts must be used when writing the formula.
calculate the change in internal energy, , when 1.34 moles of a diatomic ideal gas is heated from an initial temperature of 156 ºc to a final temperature of 421 ºc.
The change in internal energy, when 1.34 moles of a diatomic ideal gas is heated from an initial temperature of 156 ºc to a final temperature of 421 ºc is 73.8*J
Given:
Number of moles of diatomic gas = 1
Initial temperature = 156 ºc
Final temperature = 421 ºc
Now, change in temperature(T) = 421 ºc-156 ºc = 265 ºc
therefore, change in internal energy = 5/2.nRT
Here, n is the number of diatomic ideal gas heated with value 1.34
R is the universal gas constant with value of 8.314
T is the change in temperature with value 265 ºc
U = 5/2.nRT
U = 5/2*1.34*8.314*265
U = 73.8*J
Internal energy U of a system or a body with well defined boundaries is the total of the kinetic energy due to the motion of molecules and the potential energy associated with the vibrational motion aend electric energy of atoms within molecules. Internal energy also includes the energy in all the chemical bonds.
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