No, there are no concerns if you wait an hour or two after you calibrate the spectrophotometer to obtain the absorbance of your solutions and unknown as it will not change because the light source is not aging faster but if your light source age faster, then there are concerns.
Why should it be a problem when the light source is aging faster?In the case above, light source is the issue because it is deteriorating quickly. If you're lucky, the lamp's usable life will be at least four digits of hours. On the other hand, allowing the lamp to stabilize itself speeds up aging. Given the limited lifespan, it is advisable to calibrate frequently such as daily.
The calibration rate is determined by the goal of the measurement. For most photometric tests, parameter variations in the interval between calibration and measurement will be negligibly large enough to significantly increase the overall measurement error. (Take note that the amount of error in typical analytical measurements, including sample preparation, is often at or above 10%.)
The routine calibration then appears to be unnecessary because the effort you put out will be pointless. In any instance, the experimental analysis of the impact of daily or biweekly calibration (often conducted inside validation studies) will offer the response.
It may even make sense to calibrate the instrument every 5 or 10 operational hours if you are using it continuously for a long length of time. If the manufacturer changes the cuvette materials (they will also change the Lot No.), you should recalibrate depending on the light source's lifespan and the materials you used to place your samples there. however, you should be cautious of dust because it might significantly alter the outcomes if the lenses have dirt.
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What order is the typical sequence of events in the scientific method?
The typical sequence of events in the scientific method is to define question , make prediction, collect data, analyze data, Experiment, test hypothesis, draw conclusion , report result.
the following are the steps in the scientific method :
1) first step to define a question for the investigation.
2) Then make prediction : do some research related to the question and the study related theories.
3)collect the data : collect all the data from the research .
4) analyze the data
5) experiments : perform the experiments
6) test the hypothesis: accept or reject hypothesis.
7) draw the conclusion
8) report your result.
Thus , The typical sequence of events in the scientific method is to define question , make prediction, collect data, analyze data, experiments , test hypothesis, draw conclusion , report result.
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Can someone help me please
The number of moles of F₂ is 0.453 mol
The grams of F₂ are present is 17.21 g
given that :
pressure P = 5.2 atm
volume V = 2.55 L
temperature T = ( 273 + 83 ) = 356 K
using the gas equation , we get
PV = nRT
n = PV / RT
n = ( 5.2 × 2.55 ) / (0.0821 × 356)
n = 13.26 / 29.22
n = 0.453 mol
the mass of F₂ = moles × molar mas
= 0.453 × 38
= 17.21 g
Thus, The number of moles of F₂ is 0.453 mol
The grams of F₂ are present is 17.21 g
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joules to warm 59.5 mL of water ( density=1.00g/mL ) from 26.5 ∘C to 100 ∘C and vaporize it at 100 ∘C
Knowing the heat capacity of the water, we know that the heat absorbed is 1.83 * 10^4 J.
What is the heat of the water?We know that water can be able to absorb heat when it is heated and the heat that is absorbed can be able to change the state of the water. We are now going to see how we can be able to obtain the heat that is absorbed by the water.
Then;
H = mcdT
H = heat absorbed
m = mass of the water
c = heat capacity of water
dT = temperature change
Given that mass of the water = 59.5 g we can write;
H = 59.5 g * 4.18 * (100 ∘C - 26.5 ∘C)
H = 1.83 * 10^4 J
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The diagram shows the characteristics of two different components of scientific knowledge.
Component C
Component D
Risa
suggested
explanation
of a single
phenomenon
or few related
phenomena
It is testable.
It provides
a unifying
explanation for
a vast set of
phenomena
natural world
Which statement explains which component is likely to be more powerful in explaining a scientific phenomenon? (4 points)
Component C, because a theory is often based on possibility and not certainty.
Component D, because a hypothesis is often based on possibility and not certainty.
Component C, because the ability to explain several occurences in the natural world is a characteristic of a hypothesis
Component D, because the ability to explain several occurences in the natural world is a characteristic of a theory
The statement that explains which component is likely to be more powerful in explaining a scientific phenomenon is:
Component D, because the ability to explain several occurrences in the natural world is a characteristic of a theory; option DWhat constitutes scientific knowledge?Scientific knowledge refers to the body of knowledge that is obtained by the scientific method.
The scientific method refers to a series of steps that scientists follow in their discovery and explanation of natural phenomena.
The scientific method is as follows:
observationasking questionsgiving a hypothesisconducting experimentsanalyzing the results of the experimentsrepeated experiments drawing conclusions and propounding a theory based on the results of the experiments.Hence, scientific knowledge must explain universal occurrences ad must be testable.
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Which of the following best describes temperature:
A: number of molecules
B:motion of molecules
C:size of molecules
D:type of molecules
The gas tank of car hold 22.3 gallons.If the density of gasoline is 0.8206g/mL,determine the massin kilograms and pounds of the fuelin a full truck
Density = mass/Volume or D = m/V
Given: V = 22.3 gal
D = 0.8206 g/mL
1) Rearrange the equation to solve for m
2) Find conversion factor(s) and convert V from gal to mL (by dimensional analysis) so the units cancel
3) Solve for m in g
4) Find conversion factor(s) and convert m from g → lbs
1) D = m/V rearranges to m = D ∗ V
2) 1 gal = 3.785 L and 1 L = 1000 mL; 22.3 gal ∗ 3.785 L/1 gal ∗ 1000 mL/1 L = 84 406 mL
3) m = 0.8206 g/mL ∗ 84 406 mL = 69 260 g
4) 1 lb = 453.6 g; 69 260 g ∗ 1 lb/453.6 g = 153 lbs
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I really need help!
I promise I've been paying attention, it just goes in one ear and out the other ;-;
(question is in picture!)
Answer: the balanced equation is the same.
Explanation:
Every element must have the same number of atoms on each side of the equation (law of conservation of mass).
2. Balancing the equation can be done only by adjusting the coefficients.
C
is a balanced element because there is the same number of atoms of
C
in each side of the equation.
C
is a balanced element
H
is a balanced element because there is the same number of atoms of
H
in each side of the equation.
H
is a balanced element
O
is a balanced element because there is the same number of atoms of
O
in each side of the equation. O is a balanced element. Na is a balanced element because there is the same number of atoms of Na on each side of the equation. Na is a balanced element H is a balanced element because there is the same number of atoms of H on each side of the equation. H is a balanced element C is a balanced element because there is the same number of atoms on each side of the equation. C is a balanced element. O
is a balanced element because there is the same number of atoms of
O in each side of the equation. O is a balanced element. All elements have the same number of atoms on each side of the equation, which means that the law of conservation of mass is satisfied and thus the chemical equation is balanced.
e)
Calcium hydroxide reacts with carbon dioxide to reform calcium carbonate.
Ca(OH)₂ (aq) + CO₂(g) → CaCO3 (s) + H₂O(l)
(i)
Determine the mass, in g, of CaCO3 (s) produced by reacting 2.41 dm³ of
2.33 x 10-2 moldm-3 of Ca(OH)₂ (aq) with 0.750 dm³ of CO₂ (g) at STP.
The mass of Ca CO₃ produced by reacting 2.41 dm³ of 2.33 x 10-2 mol dm-3 of Ca(OH)₂ (aq) with 0.750 dm³ of CO₂ (g) at STP is 30353 g.
What is STP?The nominal atmospheric conditions at sea level are referred to as "standard temperature and pressure" (STP). The temperature and pressure are both zero degrees Celsius (atm). The STP value is crucial for many professionals, including physicists, chemists, engineers, pilots, and navigators.
1 dm³ = 1L
2.41 dm³=2.41 L
Moles of Ca(OH)₂ = m M. vol (L)
= 2.33×10⁻²m ×2.41 =5.6153 10⁻²Mol
Moles of CO₂ (n) = [tex]\frac{PV}{RT}[/tex] = [tex]\frac{(1 atm) . (0.75L)}{(0.032).(1atm).(273k)x^{2} k^{-1} ml}[/tex]
Moles of CO₂ (n) = 0.0335 mol
Ca(OH)₂ + CO₂ ⇒ Ca CO₃ + H₂O
[tex]I_{mol}[/tex] 5.6153×10⁻² 0.0335mol 0
C 0.0335mol -0.0335mol 0.0335mol
⇒ 0.022653 0 0.0335mol
Mass of Ca CO₃ = Moles × Molar mass
Mass of Ca CO₃ = 0.0335 mol ×100.0869 g/mol
Mass of Ca CO₃ = 30353 g
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Please Help Me I don't Understand It.
Answer:
Javier's model is better, as the ball-and-stick model shows distinct differences in bond, whereas Carlos' model just shows them as differently colored circles.
Please help I have been stuck for a week Which of the following reactions is BALANCED and shows INCOMPLETE combustion
A. 2C5H12 + 1102--> 12CO+ 10H2O
B. 2C5H12 + 1102--> 10CO +12H20
C. C5H12 + 802--> 5CO2+6H20
D. C5H12 + 802--> 6CO2 5H20
The reaction that is balanced and shows incomplete combustion is:
2 C₅H₁₂ + 11 O₂--> 10 CO + 12 H₂0; option B.
What is a combustion reaction?A combustion reaction is a reaction in which a substance reacts with oxygen to release large amounts of heat and light energy.
In the combustion of carbon-containing compounds, carbon dioxide and water are usually produced.
In incomplete combustion of carbon compounds, carbon monoxide or carbon (ii) oxide is produced.
For a balanced reaction, the moles of atoms of elements on the reactant side are equal to the moles of atoms on the product side.
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Which process uses the most water in the United States?
public use
irrigation
industry
power plants
The most water in the United States is used power plants (thermoelectric power)
What are thermoelectric power plants ?
Water flowing through the boiler's network of pipes is heated, turning it into steam. A shaft connecting a turbine to a generator rotates the blades of a turbine powered by high-pressure steam. As the generator turns, electricity is generated. The thermoelectric power of a given metal is that of a couple made of that metal with lead, with the thermoelectric power of lead being arbitrarily regarded as zero. Rate of change of the thermoelectromotive force of a thermocouple with temperature.
Industrial water withdrawals make up just 5% of all water withdrawals in the US, but thermoelectric power draws make up 49% of all withdrawals. About 12% of the public water supply is also used by industrial and manufacturing companies.
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Read the chemical equation shown.
3SO2 + 2HNO3 + 2H₂O → 3H₂SO4 + 2NO
Which statement is true about this chemical equation?
OH (hydrogen) was oxidized and S (sulfur) was reduced.
OH (hydrogen) was reduced and N (nitrogen) was oxidized.
OS (sulfur) was oxidized and N (nitrogen) was reduced.
OS (sulfur) was reduced and N (nitrogen) was oxidized.
The statement "OH (hydrogen) was oxidized and S (sulfur) was reduced" is true about this chemical equation.
This chemical reaction is between Sulfur dioxide and nitric acid along with water. When nitric acid reacts with Sulfur dioxide, it gives sulfuric acid and nitrogen monoxide.
In the reaction, the hydrogen atoms in H₂O are oxidized to form H₂SO₄, and the sulfur atoms in SO₂ are reduced to form H₂SO₄.
Therefore, the OH from the water molecule gets oxidized to give out Sulfuric acid. Likewise, the Sulfur from Sulfur dioxide reduces to form the product that is sulfuric acid.
Therefore, the best option that suits the reaction is OH (hydrogen) was oxidized and S (sulfur) was reduced.
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Answer:
I believe the above answer is correct after my test i will let everyone know.
Explanation:
Write the net ionic equation for this reaction Fe₂(SO4)3²(aq)+3K₂S(aq) → Fе₂S3(s)+3 K₂SO4(aq)
what are Faraday's laws of induction??? Grade 9.
Answer:
Hope It Helps You
Explanation:
Please Mark Me As BrainliestCalculate the molar it’s of a phosphoric acid solution if 34.21mL of 0.0431M sodium hydroxide neutralizes 25.00mL of the acid solution
According to the concept of molar concentration, the molarity of phosphoric acid solution is 0.0589 M.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.In case where two solutions are given, molarity of one solution is obtained as, M₁V₁=M₂V₂
Substitution in above formula gives, 0.0431×34.21/25=0.0589 M.
Thus the molarity of phosphoric acid is 0.0589 M.
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A 2.00 M HCl solution is diluted by transferring 25.0 mL of the solution to a 100.0 mL volumetric flask and adding water to the line on the neck of the flask. What is the concentration of the solution in the flask?
A) 0.250M
B) 0.500M
C) 1.00M
D) 8.00M
What is the pH of a solution that is 0.21 M sodium fluoride and 0.57 M hydrofluoric acid?
From the Henderson- Hasselbalch equation, the pH of a solution is 3.36.
How can the pH of a solution made from a weak acid and its conjugate base be calculated?The pH of a solution made from a weak acid and its conjugate base can be calculated using the Henderson- Hasselbalch equation.
The Henderson- Hasselbalch equation is given below as follows:
pH = pKₐ + log ([A⁻]/[HA])where;
pKa = - log(Ka) of hydrofluoric acid[A⁻] = concentration of salt of conjugate base, NaF[HA] = concentration of hydrofluoric acidpKa of HF = 3.8
[A⁻] = 0.21 M
[HA] = 0.57 M
pH = 3.8 + log (0.21/0.57)
pH = 3.36
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A 2.3kg object accelerated from a rest to a speed of 38.6 m/s in 37 seconds what is the answer in N
The force acting on a moving body can be determined using its acceleration and mass. The mass of the object is 2.3 Kg the force when it is accelerated to 38.6 m/s in 37 seconds is 2.4 N.
What is force?Force is an external agent acts on a body to change it from the state of motion or rest. Various kinds of forces include gravitational force, frictional force, nuclear force etc.
In physics, force is the product of mass and acceleration. Acceleration of an object is the rate of change in its velocity. Here, the change in speed from rest is 38.6 m/s and the time taken is 37 seconds hence the acceleration is:
a = 38.6 m/s / 37 s
= 1.04 m/s².
Now, the force can be calculated from by taking the product of mass and acceleration as follows:
F = ma
= 2.3 Kg × 1.04 m/s²
= 2.4 N.
Hence, the force acting on the object to change it from rest is 2.4 N.
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Addison warms a pure solid substance in a system closed off from the surroundings
This experiment shows that the elements of pure solid substance in a system closed off from the surroundings has increased temperature very fast.
What is a pure solid substance?Pure substances are substances that are built up of only one kind of particle and have a fixed or abiding structure. Pure substances are further confidential as elements and compounds. An element is a substance that comprises only one type or kind of atom. a pure substance has a constant chemical composition.
No affair where you sample a substance, it is the same. For chemistry, the safest examples of pure substances are elements and compounds. So, examples cover gold, silver, helium, sodium chloride, and pure water.
So we can conclude that In chemistry, a pure substance is an element or compound made up of one type of particle.
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Answer the question(s) below about the following reaction.
2H₂O2 → 2H2O + O2
How many moles of oxygen gas can 5.0 moles of hydrogen
peroxide (H2O2) produce, if decomposition is complete?
2.5 moles of oxygen will be produced.
What is the mole ratio?A stoichiometric problem can be characterized by two features: the information given in the problem and the information to be solved called the unknown. Both the given and the unknown can be reactants, both products, or one can be a reactant and the other a product. Quantities of substances can be expressed in moles. However, in laboratory situations, it is common to determine the amount of a substance by determining the mass of the substance in grams. The amount of gaseous substance can be expressed in terms of its volume. This concept focuses on the type of problem where both the given quantity and the unknown quantity are expressed in moles.
The molar ratio is a conversion factor that relates the molar amounts of any two substances in a chemical reaction. The numerical value of the conversion factor is obtained from the coefficients of the balanced chemical equation.
For the given reaction:
2H₂O₂ → 2H₂O + O₂
This reaction indicates that the mole ratio of H₂O₂ to O₂ is 2:1 i.e. for every two moles of H₂O₂ one mole of O₂ is produced.
So, for 5.0 moles of hydrogen peroxide, moles of oxygen will be half of 5.0, which is 2.5 moles.
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For electromagnetic radiation with a wavelength of 839.6 nm: (a) What is the frequency of the radiation (in s-1)? (b) What is the energy (in J) of one photon of the radiation? (c) What is the energy (in kJ) of one mole of photons of the radiation?
The frequency of the photon is 3.57 * 10^14 Hz. the energy in joules is 2.4 * 10^-19 J while the energy in kJ/mol is 3.9 * 10^-40 kJ/mol.
What is the energy?The energy of the photon can be obtained by the use of an adaptation of the Plank equation. Let us now use;
E = hc/λ
E = energy
h = Plank Constant
c = Speed of light
λ = wavelength
a)
c = λf
f = c/λ
Substituting values;
f = 3 * 10^8/839.6 * 10^-9
f = 3.57 * 10^14 Hz
b)
E = 6.6 * 10^-34 * 3 * 10^8/ 839.6 * 10^-9
E = 2.4 * 10^-19 J
c)
Energy in kJ/mole
Substituting values;
2.4 * 10^-19 J * 10^3/6.02 * 10^23
= 3.9 * 10^-40 kJ/mol
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23. When wood burns, only a small amount of ashes are made. We know that matter cannot be created or
destroyed. Explain why the mass of the wood before the fire does not equal the mass of the ashes after the
reaction.
for each
The mass of wood before burning does not always equal the mass of the resulting ashes after burning because some other products have been produced and lost.
Burning of woodWhen wood burns, a form of chemical change takes place and the reaction is reversible.
The products of wood burning include ashes, carbon dioxide, and water vapor. However, only ashes remain after burning because carbon dioxide and water vapor both escape into the atmosphere.
The escape of some of the products of burning into the atmosphere is one of the reasons the reaction seems to negate the law of conservation of mass.
According to the law of conservation of mass, masses are conserved during reactions but can be converted to different forms. Thus, if ashes were to be the only product of the burning of wood, then the mass of the ashes formed must be equivalent to the mass of the wood.
However, due to the formation of other products that happen to always escape into the air, the mass of ashes is not always equal to the mass of the woods that burn.
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A local AM radio station broadcasts at a frequency of 587 kHz.
Calculate the wavelength at which it is broadcasting.
Wavelength =
Explanation:
c=v * lambada
lambda= 3*10power of 8m/s ÷587×10power of 3 hzHow much heat is released during the combustion of 1.39 kg of C5H12?
The heat that is released by the 1.39 Kg of pentane is 58518 kJ.
What is the heat released?We know that the combustion of pentane is an exothermic reaction because heat is released in the process. We have to look to the balanced thermochemical reaction equation for the combustion of pentane.
Given that the number of moles of the pentane that is burnt here = 1.39 * 10^3 g/72 g/mol
= 19.3 moles
Now;
If we require 3032 kJ of energy to burn one mole of pentane
If we have 19.3 moles of pentane then we have;
19.3 moles * 3032 kJ/ 1 mole
= 58518 kJ
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Copper metal plus zinc sulfate solution
Write the Molecular equation
Write the total ionic equation
Write the Net ionic equation
Is the reaction category replacement or metathesis?
Copper metal plus zinc sulfate solution : is not possible because the copper metal is less reactive than zinc and copper cannot displace the zinc.
The copper metal with zinc sulfate reaction is not possible because copper is less reactive than the zinc cant cannot displace the zinc. so, the reaction :
Cu + ZnSO₄ ----> no reaction
but the zinc plus copper sulfate is possible , copper is less reactive than zinc and zinc can displace the copper . and the reaction is called as displacement reaction the reacion is given as :
CuSO₄ + Zn -----> ZnSO₄ + Cu
Thus, Copper metal plus zinc sulfate solution : is not possible because the copper metal is less reactive than zinc and copper cannot displace the zinc.
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Which functional groups are present in carbohydrates?
alkenes, alkynes, and phenyl groups
ethers, esters, and amides
carboxylic acids and amino groups
aldehydes, ketones, and hydroxyl groups
The functional groups are present in the carbohydrates is aldehydes , ketone , and hydroxyl groups.
Carbohydrates are the essential for living thing . they provide energy to living things. simple carbohydrates are : monosaccharides , disaccharides, oligosaccharides. Carbohydrates involves in fat metabolism. carbohydrates are also called as starch , simple sugars etc. carbohydrates found in foods . sugar is a source of carbohydrates. there are good carbohydrates which is high in nutrients moderate in calories. the bad carbohydrates are low in nutrients and high in calories.
Thus, The functional groups are present in the carbohydrates is aldehydes , ketone , and hydroxyl groups.
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covert 3.20 bar to atm
Taking into account the change of units, the 3.20 bar in atm is 3.15815 atm.
Rule of threeThe rule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.
If the relationship between the magnitudes is direct, the direct rule of three must be applied. To solve a direct rule of three, the following expression must be followed, being a, b and c known data and x the variable to be calculated:
a ⇒ b
c ⇒ x
So: x= (c×b)÷a
The direct rule of three is the rule applied in this case where there is a change of units.
Conversion of units in this caseYou can apply the following rule of three: if 1.01325 bar equals 1 atm, 3.20 bar equals how many atm?
1.01325 bar ⇒ 1 atm
3.20 bar ⇒ x
So: x= (3.20 bar× 1 atm)÷ 1.01325 bar
Solving:
x= 3.15815 atm
In summary, the pressure is 3.15815 atm.
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A local AM radio station broadcasts at a frequency of 587 kHz. ()
Calculate the energy of the frequency at which it is broadcasting.
Energy =
kJ/photon
Explanation:
E=hv
6.626*10power of -34 * 587khz
Will three different liquids lose heat at the same rate?
Yes, because of the liquid's specific heat capacity or heat capacity, different liquids heat up at varying speeds.
What does the same quantity of heat gain or lose at the same temperature?Which amount of heat is needed to raise the liquid's temperature by one degree Celsius? When analyzing a mass of 1 kg, the term "heat capacity" or "specific heat capacity" refers to the amount of heat needed to raise the temperature of 1 kilogram of liquid or fluid by 1°C.
What aspects of a liquid's rate of heat loss are there?area of the body's surface. nature of the body's surface. the body's surface's composition (material effects conductivity through walls of the body).
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A 2.00 gram sample of a glazed donut was placed in a bomb calorimeter with a heat capacity of 3.54 kcal/°C. The sample was completely burned, causing the temperature of the calorimeter to rise by 2.02 °C. How many kilocalories of energy were stored in the donut sample?
A 2.00 gram sample of a glazed donut was placed in a bomb calorimeter with a heat capacity of 3.54 kcal/°C. The sample was completely burned, causing the temperature of the calorimeter to rise by 2.02 °C. kilocalories of energy were stored in the sample is 14.30 kcal.
given that :
mass = 2 g
heat capacity = 3.54 kcal / °C
change in temperature = 2.02 °C
The heat energy expression is given as :
Q = mc ΔT
Q = 2 g × 3.54 kcal / °C × 2.02 °C
Q = 14.30 kcal
Thus, A 2.00 gram sample of a glazed donut was placed in a bomb calorimeter with a heat capacity of 3.54 kcal/°C. The sample was completely burned, causing the temperature of the calorimeter to rise by 2.02 °C. kilocalories of energy were stored in the sample is 14.30 kcal.
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