The molarity of the solution can be used to give the moles and the volume of the solution. The 0.0140 M sodium thiosulfate needs 225 ml of volume.
What is molarity?Molarity is the property of the solution that is given by the ratio of the moles of the solute to the volume of the solution in liters.
Given,
Molarity of Sodium thiosulfate = 0.0140 M
Mass of solute (AgBr) = 0.590 gm
Molar mass of AgBr = 187.77 g/mol
First moles from the mass can be calculated as,
Moles = mass ÷ molar mass
n = 0.590 g ÷ 187.77 g/mol
= 0.00314 moles
Now, the volume of the solution from molarity is calculated as,
Volume = moles ÷ molarity
= 0.00314 moles ÷ 0.0140
= 0.225 L
Therefore, 225 mL is the volume required.
Learn more about molarity here:
https://brainly.com/question/13889022
#SPJ4
In a 45 minute road trip a vehicle emitted 16. 7 g of nitrogen dioxide (NO2) from its exhaust. What is the mass of nitrogen atoms in this amount of NO2?
When a 45-minute road trip a vehicle emitted 16.7 g of nitrogen dioxide (NO₂) from its exhaust then the mass of nitrogen atoms in this amount of NO₂ would be 5.082 grams.
What is a Chemical compound?The chemical compound is a combination of two or more either similar or dissimilar chemical elements.
for example, H₂O is a chemical compound made up of two oxygen atoms and a single hydrogen atom
The molecular mass of any compound is calculated by the sum of the mass of the individual atom
As given in the problem In a 45-minute road trip a vehicle emitted 16.7 g of nitrogen dioxide (NO₂) from its exhaust
The molecular mass of the NO₂ is the sum of the mass of the nitrogen atom and the oxygen atom.
The mass of the single nitrogen atom is 14, while the mass of the single oxygen atom is 16
the molecular mass of NO₂= mass of the N atom+2×(mass of O atom)
= 14 + 2×16
=46
As 46 grams of NO₂ contain 14 grams of Nitrogen
then 1 gram of NO₂ would contain 14/46 grams of Nitrogen
then 16.7 grams of NO₂ would contain (14/46×16.7) grams of Nitrogen
The mass of a nitrogen atom in 16.7 grams of NO₂ would be 5.082 grams
Learn more about a chemical compound
brainly.com/question/12166462
#SPJ4
Use the Ideal Gal Law to calculate the following problem. How many moles of gas are contained in a 4.2 L container at 2.7 atm and 305 K?
Answer:
0.453 moles
Explanation:
The Ideal Gas Law equation looks like this:
PV = nRT
In this formula,
-----> P = pressure (atm)
-----> V = volume (L)
-----> n = moles
-----> R = Ideal Gas Constant (0.08206 atm*L/mol*K)
-----> T = temperature (K)
To find the amount of moles of gas, you can plug the given values into the equation and then simplify.
P = 2.7 atm R = 0.08206 atm*L/mol*K
V = 4.2 L T = 305 K
n = ? moles
PV = nRT
(2.7 atm)(4.2 L) = n(0.08206 atm*L/mol*K)(305 K)
11.34 = n(25.0283)
0.453 = n
Q4. When 20 g of salt is added to a beaker containing 100 g of water, the salt dissolves and seems to disappear as a solution is formed. A) What is the mass now? B) Explain your answer.
The mass of the solution is equal to 120 g. As the salt dissolves in water so it disappears when the solution is formed.
Why does salt dissolve in water?The salt dissolves in water at the molecular level, due to electrical charges. Due to this fact that both water and salt are polar, with positive and negative charges on opposite sides of their molecule. The bonds in salt are ionic and have an electrical charge.
Likewise, a water molecule is also ionic in nature, but the covalent bonds are present with two hydrogen atoms and one oxygen atom, which has a negative charge. The salt dissolves because the covalent bonds of water molecules are stronger than the ionic bonds present in the salt molecules.
The mass of the given salt is equal to 20 g while the mass of water is 100g. The total mass of the solution is equal to the sum of the mass of the solute and the mass of the solvent. Therefore, the mass of the solution will be equal to 120 grams whether the salt gets dissolved in water and get disappeared.
Learn more about salt dissolution, here:
https://brainly.com/question/14515128
#SPJ5
What is the molarity of a solution prepared by dissolving 36. 0 g of naoh in enough water to make 1. 50 l of solution?
0.6 mol / L is the molarity of a solution prepared by dissolving 36. 0 g of NaOH in enough water to make 1. 50 l of solution.
The amount of a substance in a specific volume of solution is known as its molarity (M). The number of moles of a solute per liter of a solution is known as molarity. The molar concentration of a solution is another term for molarity.
The ratio employed to indicate the solution's concentration is called its molarity. Understanding a solution's molarity is important since it allows you to determine the actual concentration as well as whether the solution is diluted or concentrated.
Amount of NaOH = 36. 0 g
Amount of water = 1. 50 L
1 mol of NaOH = 40 g,
Moles of NaOH = 36. 0 / 40 g = 0.9 mol NaOH
Molarity of a solution = moles of solute / Liters of solution
Molarity of a solution = 0.9 / 1.50
Molarity of a solution = 0.6 mol / L
To know more about Molarity refer to: https://brainly.com/question/8732513
#SPJ4
Why does it take a larger partial pressure difference for oxygen to dissolve in plasma vs. carbon dioxide?
It take a larger partial pressure difference for oxygen to dissolve in plasma vs carbon dioxide because of its much higher solubility in plasma.
What is Partial Pressure ?Partial pressure is defined as the pressure of anyone gas that arises in the container with more than one gas and each gas exert pressure. Partial pressure is calculated only for gases which is exist in the same volume.
Why does it take larger partial pressure for oxygen dissolve in plasma ?Oxygen dissolve in plasma because oxygen exerts a certain amount of partial pressure. Plasma cannot carry much oxygen because of its solubility.
Thus from the above conclusion we can say that It take a larger partial pressure difference for oxygen to dissolve in plasma vs carbon dioxide because of its much higher solubility in plasma.
Learn more about the Partial Pressure here: https://brainly.com/question/19813237
#SPJ4
Small, non-polar molecules exhibit a higher rate of diffusion than large, charged ones.
a. true
b. false
What may indicate that the pressure within a container is increasing and that container failure may be imminent?
Answer:
An increase in the intensity of sounds or fire issuing from a relief valve.
What does "contents under pressure" mean?Propane serves as the propellant in all aerosols. R-12, a Freon that was the previous propellant, has been outlawed because it harms the ozone layer above the poles. Propane and R-12 share the same pressure-temperature characteristics.
Propane's boiling point is quite low. It desires a boil-off at ambient temperature. And it continues to do so until the pressure inside a closed container rises to roughly 150 psi (give or take depending on temperature), at which time the boiling point is raised high enough to cause the substance to stop boiling.
"Contents Under Pressure" is exactly what the notice indicates. Paint, hairspray, lubricant, wasp and hornet spray, among other liquids, can be found within an aerosol can, which is a pressure vessel. By inspecting the bottom, you may determine whether a vessel is a pressure vessel. If it is dished in like a bowl, it has the same pressure-holding end as a huge propane tank, with the exception that the curve on the latter has an outward orientation. On aerosol canisters, it is inward because they must sit upright for ease. A circular bottom just cannot accomplish that. But the top resembles an outer hemisphere more or less.
Thank you,
Eddie
A ballasted flocculation process has two hydrocyclones in operation (two trains) with an influent flow of 6,000 gpm and a microsand slurry recirculation rate of 300 gpm. Six volumes of samples from the train produced the following volumes of settled microsand: 20 mL, 15 mL, 15 mL, 30 mL, 20 mL, and 20 mL. The six volumes of samples collected in the cone averaged 2,000 mL. Calculate Cm, the microsand concentration in the tanks, in grams of microsand per liter (g/L).
The Cm of the Microsand concentration in the tanks when expressed in grams of Microsand per liter (g/L) is known to be 3.8 g/L.
What is Microsand?This is known to be a kind of aggregate, that is said to be exempted from clay and shale and it is one that can rightly fine to pass via a No. 100 (that is 150 µm) sieve.
Note that from the question:
The Average of six samples = 30mg/L.
Then one need to Multiply:
30 by 300gpm x 1 Train x 1700 ( this is the use of the bulk density conversion factor).
Then one need to also Divide by (4000 gpm x 2000 mL) = 1.8 g/L.
Lastly you then multiply by 2,
1.8 g/L x 2 = 3.8 g/L.
Therefore, looking at the solution above, the Cm of the Microsand concentration in the tanks is seen to be 3.8 g/L.
Learn more about flocculation from
https://brainly.com/question/15057637
#SPJ1
The iodine test is used to test for the presence of starch which is a type of ___________ treated with an iodine solution, the starch reacts with the iodine solution and produces a ___________ color.
A. protein, blue-purple
B. protein, yellow
C. carbohydrate, yellow
D carbohydrate, blue-purple
When
Answer:
D. carbohydrate, blue-purple
Explanation:
Carbohydrates are one of many types of macronutrients found in certain foods and drink. For example, sugars, starches, and fibers are carbohydrates.
When starch is present, using an iodine solution will turn it blue-black or purple. If starch is NOT present, it will stay orange or yellow. The reason starch reacts with iodine is due to the amylose present in starch. Iodine is not soluble in water, so it's dissolved along with potassium iodide that forms a triiodide molecule. That then enters the helical structure of amylose and changes its color.
Extra was made by mixing different components together but it appears to have only one phase which term best describes categorizes make sure a
Solution is the term which best describes mixture A which was made by mixing different components together but has only one phase.
What is solution?Any mixture of one or more solutes that have been dissolved in a solvent is referred to as a solution.To create a homogenous mixture, a solute must dissolve in a solvent.The material known as a solute dissolves in a solvent to form a homogenous mixture.The material that is present in the highest concentration is called a solvent.A true solution won't spin apart in a centrifuge.It has a uniform distribution of particles.Example of homogenous mixture is the solution of salt and water.Learn more about solution here:
https://brainly.com/question/13812915
#SPJ4
Na -k pumps couple atp hydrolysis with the transport of na and k. in which direction do they move those ions?
Na -k pumps couple atp hydrolysis with the transport of Na and k.
Both ions are used for active transport.
d. K+ and Na+ both diffuse into the cell along their concentration gradients and drive the transport of glucose.
Na/K pump is a pump located on the plasma membrane which uses ATP to move 3 Na ions out the cell and brings in 2 K ions into the cell. It is an example of primary active transport. As a consequence, concentration of Na is higher outside the cell, while K concentration is higher inside the cell.
Glucose is transported in the cell against its gradient, together with Na ions (symport) which move down their concentration gradient.
This is an example of secondary active transport because it uses the energy from the primary active transport to move other substances such as glucose against their own gradients.
Learn more about atp hydrolysis :https://brainly.com/question/13056741
#SPJ4
What is the frequency of an x-ray
wave with an energy of
2.0 x 10^-17 J?
Please explain how!
Answer:
3.3 x 10⁻¹⁷ Hz
Explanation:
To find the frequency, you can use the following equation:
E = h / f
In this equation,
-----> E = energy (J)
-----> h = Planck's Constant (6.626 x 10⁻³⁴ J*s)
-----> f = frequency (Hz)
You can plug the given values into the equation and simplify to find the frequency. This equation will require a little bit of rearranging.
E = h / f <----- Given equation
(2.0 x 10⁻¹⁷ J) = (6.626 x 10⁻³⁴ J*s) / f <----- Insert values
(2.0 x 10⁻¹⁷ J) x f = (6.626 x 10⁻³⁴ J*s) <----- Multiply both sides by f
f = 3.3 x 10⁻¹⁷ Hz <----- Divide both sides by 2.0 x 10⁻¹⁷
The frequency of an x-ray wave with an energy of 2.0 x 10^-17 J is 3.3 x 10⁻¹⁷ Hz.
What is frequency ?
The term frequency is defined as the number of waves that pass a fixed point in unit time. Frequency is measured in hertz which is equal to one event per second.
Frequency also describes the number of cycles undergoes during one unit of time by a body in periodic motion.
Calculating the frequency, you can use the following equation:
E = h / f
Where,
E = energy (J)
h = Planck's Constant (6.626 x 10⁻³⁴ J*s)
f = frequency (Hz)
Insert his values in the given equation
(2.0 x 10⁻¹⁷ J) = (6.626 x 10⁻³⁴ J × s) / f
(2.0 x 10⁻¹⁷ J) x f = (6.626 x 10⁻³⁴ J × s)
f = 3.3 x 10⁻¹⁷ Hz
Thus, The frequency of an x-ray wave with an energy of 2.0 x 10^-17 J is 3.3 x 10⁻¹⁷ Hz.
To learn more about the frequency, follow the link;
https://brainly.com/question/5102661
#SPJ2
Rounding to the nearest
tenth, what is the mean of
85, 85, 100, 90, 100, 85,
80, 100, 90?
For calculating mean value, add up all of the values then divide by the number of them. 815/9 is about 90.6
What is mean value?The mean refers to the average of a set of values. The mean can be computed in a number of ways, including the simple arithmetic mean (add up the numbers and divide the total by the number of observations), the geometric mean, and the harmonic mean.
Moreover, the mean can be used to represent the typical value and therefore serves as a yardstick for all observations. For example, if we would like to know how many hours on average an employee spends at training in a year, we can find the mean training hours of a group of employees.
Hence, the mean can be calculated only for numeric variables, no matter if they are discrete or continuous. It's obtained by simply dividing the sum of all values in a data set by the number of values.
Learn more about mean value:
https://brainly.com/question/14882017
#SPJ2
Strontium-89 undergoes beta decay, after 88 days a sample has decreased to 30% its original size. What is the half-life of sr-89?.
The half-life of sr-89 will be 51 days.
What is a Beta decay?In nuclear physics, beta decay is a type of radioactive decay in which an atomic nucleus emits a beta particle (a fast energetic electron or positron), which changes the original nuclide into an isobar of that nuclide. Prior to beta decay, neither the beta particle nor the associated (anti-)neutrino is present in the nucleus; instead, they are produced during the decay process. This procedure gives unstable atoms a protons-to-neutrons ratio that is more stable.The weak force, which is characterized by relatively slow decay durations, results in beta decay. Up and down quarks make up nucleons, and the weak force allows a quark to change the flavor of its lepton by emitting a W boson, which produces an electron/antineutrino or positron/neutrino pair.For instance, the disintegration of a neutron, which consists of two down quarks and an up quark, produces a proton, which consists of a down quark and two up quarks.Because the fundamental nuclear mechanism, mediated by the weak force, is the same, electron capture is occasionally considered a kind of beta decay. In electron capture, a proton in the nucleus captures an inner atomic electron, turning it into a neutron, and releasing an electron neutrino.To learn more about beta decay strontium-89 click here-
https://brainly.com/question/26626062
#SPJ4
54.0g Al reacts with 64.0g O2 to form Al2O3 according to the equation.
4Al+3O2 = 2Al2O3
O2: 32 g/mol Al2O3: 102 g/mol
How many grams of Al2O3 form from 64.0 g O2?
[?]g Al2O3
Answer:
136 g Al₂O₃
Explanation:
Assuming you do not need to find the limiting reactant, to find the mass of Al₂O₃, you need to (1) convert grams O₂ to moles O₂ (via molar mass), then (2) convert moles O₂ to moles Al₂O₃ (via mole-to-mole ratio from equation coefficients), and then (3) convert moles Al₂O₃ to grams Al₂O₃ (via molar mass). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given value (64.0 g).
Molar Mass (O₂): 32 g/mol
Molar Mass (Al₂O₃): 102 g/mol
4 Al + 3 O₂ -----> 2 Al₂O₃
64.0 g O₂ 1 mole 2 moles Al₂O₃ 102 g
----------------- x -------------- x ------------------------ x ------------- = 136 g Al₂O₃
32 g 3 moles O₂ 1 mole
Answer:
Explanation:
Based of the fact that you were given 2 masses I would assume this to be a limiting reagent question. However amount on the left side both equal 2. Ignoring limiting reagents and focusing on just O2 the steps would be:
1. Make sure the equation is balanced ( already given)
2- Use given values to find the mols of O2 (mass/molar mass)
3. Mols are conserved but due to the coefficients the molar value from O2 must be divided by three and multiplied by 2 to ensure proper ratios
4. Using that amount the mass can derived using amount/molar mass
5. Use proper significant digits and units(3 in this case)
Changes in the composition of the atmosphere have caused gradual changes in earth's _______ throughout history, causing changes in plant and animal life that contributed to mass extinctions.
climate
Changes in the composition of the atmosphere have caused gradual changes in earth's climate throughout history, causing changes in plant and animal life that contributed to mass extinctions.
The following are some of the reasons:
UV lightclimatepollutantshydrofluorocarbonsheat
The surface of the Earth warms up as sunlight strikes it. Surface-emitted infrared light is absorbed in the atmosphere and transformed into heat. The temperature close to the surface rises as a result of this heat being trapped in the atmosphere.UV light:indirect impacts of climate change on UV radiation from the surface. By changing the concentrations of ozone, UV-absorbing tropospheric gases, aerosols, and clouds in the atmosphere, climate change may have indirectly affected UV radiation levels in the past. These influences are probably going to persist in the future.climate:People are at risk from food and water shortages, greater flooding, high heat, an increase in disease, and economic loss due to climate change. Conflict and human migration are potential outcomes. Climate change is the top hazard to world health in the twenty-first century, according to the World Health Organization (WHO).pollutants:these are also resulting in the increase of temperature of the Earth and is also damaging ozone layer.To learn more about the changes in earth visit:
https://brainly.com/question/13434833?
#SPJ4
The coefficient of performance (cop) of a refrigerator is defined as the ratio of?
The coefficient of performance (cop) of a refrigerator is defined as the ratio of " the work necessary to heat or cool something usefully."
The usable heating or cooling delivered to work required ratio, also known as the coefficient of performance, or COP, of a heat pump, refrigerator, as well as air conditioning system. Higher efficiency, less energy (power) usage, and thus reduced operational costs are all related to higher COPs.
Coefficient of performance formula:
[tex]K = Q_{H} / W_{in}[/tex]
where, K = Coefficient of performance, [tex]Q_{H}[/tex] = heat of pumps output, [tex]W_{in}[/tex] = work required by the system.
It is refrigeration's coefficient of performance (COP) will always be greater than 1.
Therefore, the coefficient of performance (cop) of a refrigerator is defined as the ratio of " the work necessary to heat or cool something usefully."
To know more about coefficient of performance
https://brainly.com/question/14058512
#SPJ4
You are working in a lab on your magnetic levitation experiment. You are standing directly in front of two magnets. Another scientist near you has a malfunction with their equipment and gamma radiation is emitted directly at you, passing through the magnets first. You are wearing a lab coat and goggles. Are you safe?
A. Yes, gamma radiation is not deflected by magnets but it is easily blocked by the lab coat.
B. Yes, gamma radiation is strongly deflected by magnets so it would have missed you.
C. No, gamma radiation is only slightly deflected by magnets so it would still hit you if you were close to the magnets.
No, gamma radiation is only slightly deflected by magnets so it would still hit you if you were close to the magnets. That is option C.
What is magnetic levitation?Magnetic levitation which is also called magnetic suspension is defined as the phenomenon in which two magnetic objects are repelled from each other in a vertical direction.
Gamma radiation is defined as a type of electromagnetic wave with the highest energy and shortest wave length.
The gamma rays do not possess any charge and therefore are not affected by electric or magnetic fields.
Therefore, when gamma radiation is mistakenly emitted directly at you, passing through the magnets first, it will still hit you because the ray are only slightly deflected by magnets.
Learn more about magnets here:
https://brainly.com/question/27862911
#SPJ1
A glow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.
A glow stick will glow longer at lower temperatures than at room temperature, one can infer from the observation. Temperature and reaction time are the test variables.
We notice in this reaction that a glow stick stored in the freezer lights for a longer period of time than a glow stick stored at normal temperature. This implies that temperature affects how long a response lasts.
The most straightforward explanation for this observation is that glow sticks glow longer in colder temperatures than they do at room temperature; as a result, glow sticks kept in the freezer are observed to glow longer than glow sticks kept at room temperature.
To learn more about chemicals to the given link:
https://brainly.com/question/24600141
#SPJ4
The ph of a 0. 50 m solution of base b is found to be 10. 19. what is the kb of the base? the equation described by the kb value is b(aq) h2o(l)↽−−⇀bh (aq) oh−(aq)
The pH of a 0.50 M solution of base B is found to be 10.19. The Kb of the base is 4.8 × 10⁻⁸.
Let's consider the following basic reaction.
B(aq) + H2O(l) ⇄ BH(aq) + OH⁻(aq)
First, we will calculate the pOH of the solution using the following expression. (14-10.19)=3.81
antilog -3.81=1.55×10^-4/0.50=4.8×10^-8
The pH of a 0.50 M solution of base B is found to be 10.19. The Kb of the base is 4.8 × 10⁻⁸.
Learn more about Kb for this base here brainly.com/question/6465134
#4262
The [tex]K_b[/tex] of the base b is 4.805 × 10⁻⁸.
What is dissociation constant?The dissociation constant is a type of equilibrium constant that measures the degree of dissociation of a salt.
[tex]K_a[/tex] is the dissociation constant for the acid which describes the strength of an acid.
[tex]K_b[/tex] is the dissociation constant of the base which describes the strength of a base.
pOH = 14 - pH = 14 - 10.19 = 3.81
pOH = -log[OH⁻]
3.81 = -log[OH⁻]
Antilog (-3.81) = [OH⁻]
[OH⁻] = 1.55 × 10⁻⁴
Here,
[tex]K_b= \frac{[BH^+][OH^-]}{[B]}[/tex]
= [tex]\frac{(1.55\times10^{-4})(1.55\times10^{-4})}{0.50}[/tex]
= 4.805 × 10⁻⁸
The Kb of the base b is 4.805 × 10⁻⁸
Learn more about dissociation constant:
https://brainly.com/question/9560811
#SPJ4
Which are products of nuclear fusion? check all that apply. energy helium gas high temperatures hydrogen gas low pressure
The products created during nuclear fusion are Energy and Helium Gas
Overall, two positrons, two neutrinos (which convert two of the protons into neutrons), and energy are released along with the fusion of four protons into one alpha particle.
What is Nuclear fission ?Nuclear fission is a nuclear reaction in which low energy neutrons are used to smash the nucleus of an atom into smaller nuclei. In this process, a large amount of energy is released. Nuclear fission reactions are employed in nuclear power reactors due to their simplicity and high energy output.
What is Nuclear fusion ?When two or more atoms come together to produce one heavier nucleus, the process is known as nuclear fusion. This process releases a tremendous quantity of energy, far more than the energy
Learn more about Nuclear fusion and fission here:
https://brainly.com/question/13859758
#SPJ4
Generating a rate law is complicated when the rate-determining step is preceded by a?
By generating a rate law is complicated when the rate-determining step is preceded by 'a' is a Equilibrium reaction.
What is rate law?The rate law shows about the rate of chemical reaction depends on reactant concentration.
According to rate law, the rate of reaction is directly proportional to the concentration of reaction which is raised to a stiochiometric coefficient which is determined experimentally.
Thus, from above we concluded that if the preceding reaction is an equilibrium, that compromises the simplicity of writing the rate law from the stiochiometry of the rate determining step will be used up in the reverse reaction of the equilibrium.
learn more about rate law :
https://brainly.com/question/14779101
#SPJ4
Consider the slightly soluble base bs(oh)2. if the molar solubility of the base is 1.82 ⋅ 10 − 2 , what concentration of hydroxide is dissolved in a saturated solution?
Answer:
Explanation to the following:
Find the volume occupied by 22. 0 g of helium gas at 26. 0 ° C and 1. 20 atm of pressure.
The volume occupied by 22. 0 g of helium gas at 26. 0 ° C and 1. 20 atm of pressure is 112.37 L .
Calculation ,
According to ideal gas equation ,
PV = nRT ....(i)
where P is the pressure = 1. 20 atm
V is the volume of the helium gas = ?
R is the universal gas constant = 0.082 atm L /K mol
T is the temperature of the gas = 26. 0 ° C = 299 K
n is the number of moles
Number of miles (n) = given mass/ molar mass =22 g/4 = 5.5 moles
By putting the value of pressure , volume , temperature and universal gas constant in equation ( i) we get
1. 20 atm ×V = 5.5 moles × 0.082×299
V = 5.5 moles × 0.082×299/1. 20 atm = 112.37 L
To learn more about helium gas please click here ,
https://brainly.com/question/13645498
#SPJ4
What is the molality of ethylene glycol, c2h4(oh)2, in a solution prepared from 2. 331×103 g of ethylene glycol and 2. 00×103 g of water, h2o?
Molality of ethylene glycol, C₂H₄(OH)₂, in a solution prepared from 2. 331×10³ g of ethylene glycol and 2.00×10³ g of water, H₂O is 47.6m
Ethylene Glycol is known as C₂H₄(OH)₂. It is added in water to prepare an Antifreeze solution.
Given,
Mass of Ethylene Glycol = 2.331 × 10³ g = 2.331kg
Mass of Water = 2.00 × 10³ g
Since, Ethylene Glycol is in excess. Hence, it acts as a solvent and water acts as a solute.
We know, Molar Mass of Water = 18g
Hence, Moles of Water = Given mass of water / Molar Mass of Water
⇒ Moles of Water = 2000 / 18
⇒ Moles of Water = 111.1
Molality is defined as the moles of solute present in a given solvent in kg.
∴ Molality = Moles of Solute / Mass of Solvent (in kg)
Molality = Moles of Water / Mass of Ethylene Glycol
⇒ Molality = 111.1 / 2.331
⇒ Molality = 47.6m
Molality of ethylene glycol, C₂H₄(OH)₂, in a solution prepared from 2. 331×10³ g of ethylene glycol and 2.00×10³ g of water, H₂O is 47.6m
Learn more about Molality here, https://brainly.com/question/17034043
#SPJ4
When the forecast calls for freezing rain, salt is often spread on the roads. Why is this done?
Sodium has a density of 0.968 g/cm3 and crystallizes with a body-centered cubic unit cell. Part A Calculate the radius of a sodium atom.
The radius of a sodium atom is determined as 2.145 x 10⁻⁸ cm.
What is body-centered cubic unit cell?
Body-centered cubic (BCC) is the name given to a type of atom arrangement found in nature.
A body-centered cubic unit cell structure consists of atoms arranged in a cube where each corner of the cube shares an atom and with one atom positioned at the center.
Volume of the sodium atomThe volume of the sodium atom is calculated as follows;
V = ZM/Nρ
where;
Z is 2 for a body-centered cubic unit cellM is mass of sodium atom = 23 g/molρ is density of sodium atomN is Avogadro's numberV = (2 x 23) / (6.023 x 10²³ x 0.968)
V = 7.89 x 10⁻²³ cm³
Edge length of the unit cella = (V)^¹/₃
a = (7.89 x 10⁻²³ cm³)^¹/₃
a = 4.29 x 10⁻⁸ cm
Radius of the unit cellr = a/2
r = ( 4.29 x 10⁻⁸ cm) / 2
r = 2.145 x 10⁻⁸ cm
Thus, the radius of a sodium atom is determined as 2.145 x 10⁻⁸ cm.
Learn more about sodium atom here: https://brainly.com/question/25033306
#SPJ1
What is the color of the indicator thymol blue in a solution that has a ph of 11?.
Answer:
Red
Explanation:
Red color is evidenced when thymol blue indicator is in a solution having a pH of 11. A pH of 11 means that the solution is basic or alkaline. Therefore, the indicator turns red, indicating that the solution is alkaline.
When thymol blue indicator is in a acidic solution, the indicator remains blue.
Which of the following are considered to be
part of the study of chemistry?
SELECT ALL THAT APPLY
a
properties of matter
b changes to matter
C
interactions between living things
d composition of matter
Chemistry deals with elements and compounds. The properties of matter, changes to matter, and composition of matter are studied in chemistry. Thus, options a, b, and d are correct.
What is chemistry?Chemistry is said to be a scientific field under natural sciences that studies the structure, properties, and composition of matter. It includes atoms, elements, and compounds.
The chemistry includes topics like the properties of matter, including the volume, density, temperature, etc., changes to a matter involving condensation, freezing, vaporization, melting, etc.
The composition of matter including the sub-atomic levels is studied in chemistry. Whereas, the interactions between living things are studied in biology.
Therefore, options a, b, and d. the properties, changes, and composition are studied in chemistry.
Learn more about chemistry here:
https://brainly.com/question/5243081
#SPJ2
What is the daughter nucleus produced when Au195 undergoes electron capture?
Pt195 having 78 atomic number is the daughter nucleus produced when Au195 undergoes electron capture.
An unstable isotopes can undergoes radioactive decay to form a more stable isotopes . Initial isotopes is called parent nuclide and the resultant isotopes from radioactive decay is called the daughter nuclide There are several radioactive decay like alpha decay , beta decay , gamma decay , electron capture etc .
In electron capture , the atom have only one less which is daughter isotopes than electron than atomic number of parent isotopes.
learn more about isotopes,
https://brainly.com/question/11680817
#SPJ4
