What is Calorimeter: Definition and 67 Discussions
A calorimeter is an object used for calorimetry, or the process of measuring the heat of chemical reactions or physical changes as well as heat capacity. Differential scanning calorimeters, isothermal micro calorimeters, titration calorimeters and accelerated rate calorimeters are among the most common types. A simple calorimeter just consists of a thermometer attached to a metal container full of water suspended above a combustion chamber. It is one of the measurement devices used in the study of thermodynamics, chemistry, and biochemistry.
To find the enthalpy change per mole of a substance A in a reaction between two substances A and B, the substances are separately added to a calorimeter and the initial and final temperatures (before the reaction has started and after it has finished) are noted. Multiplying the temperature change by the mass and specific heat capacities of the substances gives a value for the energy given off or absorbed during the reaction. Dividing the energy change by how many moles of A were present gives its enthalpy change of reaction.
q
=
C
v
(
T
f
−
T
i
)
{\displaystyle q=C_{v}(T_{f}-T_{i})}
Where q is the amount of heat according to the change in temperature measured in joules and Cv is the heat capacity of the calorimeter which is a value associated with each individual apparatus in units of energy per temperature (Joules/Kelvin).
When solving "coffee cup calorimeter" problems, you're supposed to include the solute mass with the mass of your solution.
However, you're also supposed to assume that dilute solutions have the same density and heat capacity as water.
So if I add 5g of NaOH to 500g of water, the solution...
First, I calculated the number of moles of glucose.
n = m / M
n = 1.8 / 180
n = 0.01 moles of glucose
So I checked the combustion reaction.
1 C6H12O6 + 6 O2 -> 6 CO2 + 6 H20
1 + 6 -> 6 + 6
0.01 + 0.06 -> 0.06 + 0.06
I considered the number of moles at the end of the reaction.
I subtracted...
Q=heat capacity calorimeter*(-)change in T*moles
=0.009089mol*-6.8C*4.38kj/C
=-0.2707kj/mol
This answer is wrong but it was the only one I could come up with right now. I just noticed units in the answer would be wrong too. Any suggestions?
Hi
I want to look at the energy resolution of a homogeneous calorimeter, in the literature I found that is given by
σ/E = a ⊕ b/√E ⊕ c/E and I found that the ⊕ means quadratic sum, what does quadratic sum mean?
Thanks
Aaron
Since ΔT is change in temperature, the container and it's contents and the led most have same temperature difference when the led is added. I tried by assuming that energy released by the led is same as the amount that container and it's contents absorb. Meaning Q1-Q2 = 0 => Q1 = Q2.
$$ \Delta...
Homework Statement
Hey there guys, first of all English is not my main language so it will be a little hard for me to say things in english. I am dutch native speaker so I will translate most of the things in english using google translator. I hope you guys are okay with that.
Task :
One wants...
Homework Statement
Steam runs through a pipe, and the state of the steam is required to be found. To do this, some of the steam was condensed inside a container filled with water.
The container weighs 850g, and has 8kg of liquid water inside it initially. The whole system was measured to be...
Homework Statement
There is 100g of water inside of a 50g aluminum calorimeter. After a reaction takes place the temperature of the calorimeter goes from 20 degrees celsius to 25 degrees celsius
Find the energy released by this exothermic reaction
specific heat capacity of water is 4.18 and...
Homework Statement
A calorimeter is made from layers of lead (1.75mm thick) alternated with layers of scintillator. The radiation length ##X_0## of lead is ##0.64cm##.
In an EM shower the number of particles doubles and the energy of each particle halves per radiation length travelled. The...
Well that's a fast question, I mainly seek for a confirmation... Is it a fact that the reason behind having lower granularity for the HCAL in ATLAS is that the Hadronic Showers are in general wider and deeper than the Electromagnetic ones? So the HCAL doesn't need high granularity (dealing with...
I've got a problem:
A piece of copper with mass m1 = 800 g and temperature t1 = 80 ° C is placed in a container with good thermal insulation. The vessel initially contains water with mass m2 = 500 g temperature t2 = 20 C. What is the calorimeter (including thermo meter) heat capacity if the end...
1. The problTfem statement, all variables and given/known data
Determine the result when 100g of steam at 100C is passed into a mixture of 200g of Water and 20g of ice at exactly 0C in a calorimeter which behaves thermally as if it were equvalent to 30g of water.
Homework Equations
FInding the...
Homework Statement
My book says that bomb calorimeters are used to measure ΔE while coffee cup calorimeters are used to measure ΔH. Isn't ΔE for bomb calirometers the same as ΔH?
Homework EquationsThe Attempt at a Solution
Bomb Calorimeter:
ΔH = ΔE + PΔV = ΔE (since, constant volume).
So ΔH =...
Homework Statement
The water equivalent in kg, of a calorimeter having a mass of 0.3 kg and a specific heat of 0.2 is
Homework Equations
q=cmT
The Attempt at a Solution
I wanted to set cmT = cmT for the water and calorimeter, but I don't know what the equilibrium temperature is.
So what do I do?
Need a little help, as I seem to have gotten confused.
Looking over past exam questions for the heat capacity of a calorimeter, this one is the one I am looking at :
A sample of the sugar fructose (C6H12O6) of mass 0.900 gwas placed in a calorimeter and
ignited inthe presence of excess oxygen...
Is a coffee cup usually considered to be a closed system? Why or why not? Does it matter that steam or hot coffee may be evaporating? (I think the steam is usually considered to be an insignificant amount of matter, allowing classification to be a closed system, but am unsure.)
Is a bomb...
Homework Statement
A copper calorimeter cup with a mass of 0.27 kg contains 0.125 kg of water. At 17°C. If 95g of an unknown substance at 93°C is placed into the cup, the temperature increases to 35°C. Find the specific heat capacity of the unknown substance.
Homework Equations
Qreleased +...
Homework Statement
Calculate the calorimeter constant
50 ml H2O = 50g
Starting Temp for hot water = 52.3°C
Starting Temp for cold water = 21.8°C
Final Temp = 41.3°C
Change in Temp = Hot = -11°C / Cold = 19.5°C
Homework Equations
Q = mcΔT
The Attempt at a Solution
Q =...
1. In the bomb calorimeter used for the test the water is recondensed after it is vaporized
In the bomb calorimeter we measure the HHV as the steam formed there is condensed. What I want to know is how the steam is re condensed? In the wikipedia it says In more recent calorimeter designs, the...
What is the difference between the two, in that EM calorimeter will stop photons and electrons effectively wheras hadronic calorimeters stop hadrons effectively (but both do not seem to affect much muons)? What materials are used in each type?
One usually hears that the EM calorimeters...
Homework Statement
A sample of K (s) of mass 2.740g undergoes combustion in a constant volume calorimeter at 298.15K . The calorimeter constant is 1849 J/K , and the measured temperature rise in the inner water bath containing 1450 of water is 1.60K
Calculate the enthalpy of formation for...
Homework Statement
A 50.0g copper calorimeter contains 250g of water at 20 deg celsius. How much steam must be condensed into the water if the final temperature of the system is to reach 50 deg celsius?Homework Equations
Can someone explain how to find the Ls? I was told that just plugging in...
Homework Statement
nickel weights 28.2g and is heated to 100°C
150g water at 13.5°C
After the nickel is placed in the water, the final temperature of the metal and water is 25°C.
Find the specific heat capacity of nickel
Homework Equations
Q=mcΔT
The Attempt at a Solution...
Homework Statement
Consider the combustion of octane that is burned in a bomb calorimter in the presence of 10.00kg of water. When burning 8.10mL of octane (.703g/ml=d) the temp. of the surrounding water increase by 5.66°C. The heat capacity of the bomb calorimter is 6.656Kj/ °C and the...
What is different between a bomb calorimeter and a coffee cup calorimeter that makes one only constant volume and the other only constant pressure?
to me, it seems that both of them should have constant volume because they are both closed containers...
and why is the pressure in a coffee...
I have a project due tomorrow and i need Help ... Calorimeter Experiment !
Homework Statement
My groups is terrible and is basically refusing to do any work---that's the real problem
My (other) problem is this:
I have a piece of copper that I am using as a calorimeter, I'm placing it inside...
Homework Statement
cold water: 50g
cold water temp: 22.23 C
hot water: 50 g
hot water temp: 63.2 C
final temp: 39.55 C
Homework Equations
The Attempt at a Solution
heat lost by hot water:
(4.18)(50)(39.55-63.22)=-4942.85
heat gained by cold water...
Homework Statement
A 200.0 g aluminum calorimeter holds 300g of water at 75 C. 20 g of ice at 0 C are added to the water. What is the final temperature of the mixture?
Homework Equations
Use Lf= 33.5 x 104
Cal= 900 J/kg C
The answer is 66.5 C
The Attempt at a Solution...
Homework Statement
A 50.0g copper calorimeter contains 250 g of water at 20 C. how much steam must be condensed into the water if the final temperature of the system is to reach 50 C?
Homework Equations
Q=-mLv where Q is heat energy, m is mass, Lv is latent vaporization constant of water...
Homework Statement
50g copper calorimeter contains 250g of water @ 20 degrees C.
how much steam must be condensed into water if the final temp. of system is 50 degrees C?
Homework Equations
MwCw(T-Tw) = -MxCx(T-Tx)
The Attempt at a Solution
I converted grams to kg and celcius to kelvins...
Homework Statement
A 30.0mL sample of 0.937M A is mixed with 16.7mL of 0.904M B in a constant pressure calorimeter. The thermochemical equation for this reaction is:
A(aq) + B(aq) --> C(aq) + D(aq); ΔH = 41.2kJ
Both solutions are at 24.9 degrees Celsius prior to mixing and reacting. What...
Hot water:
v- 50ml
delta t = -28.5
Cold water
v=50ml
delta t = 24.5
delta H of warmwater is a 50g(4.184)(-28.5) = -5962.6
delta H of cold water = 5125.45
From there i don't know what to do to find the Calorimeter constant any help? Also i did the above calculations correct right?
I am going to define these things as I understand them. Please correct/refine them as necessary.
A bomb calorimeter is a small volume capsule within a tank of water. A reaction is carried out within this small capsule and the heat evolved is transferred to the water and the heat change of the...
Homework Statement
A slice of banana weighing 2.502g was burnt in a bomb calorimeter producing a temperature rise of 3.05 C. The combustion of 0.316g of benzoic acid in the same calorimeter produced a tempterature rise of 3.24 C. The heat of combustion of benzoic acid at constant volume is...
Homework Statement
Student uses another calorimeter with a heat capacity of 133.2 J/°C. S/he fills the calorimeter with 100.0 g of 25.00°C dilute HCl solution and adds 0.496 g Mg metal (24.3 g/mol). The final temperature of the apparatus comes to 41.37°C.
What is the enthalpy change for the...
Calorimeter questions?
Homework Statement
I need help with answering some questions
A. Why do the temp of HCl and NaOH have to be essentially equal before mixing them?
B. Why is it necessary to measure the volumes of the liquids as accurately as possible?
Homework Equations...
In bomb calorimeter, when dry ice is added to warm water, the final mass of the inner cup and remaining water is less than the initial mass of the inner cup and water.
The calorimeter did not decrease in mass so it means water is lost but not gone it just changes it state.
The water was in...
Homework Statement
6550 J of electrical heat is added to a constant pressure calorimeter containing 125 grams of water at 22.6 ◦C. If the final temperature of the calorimeter is 33.7 ◦C, the heat capacity of the calorimeter (including the water) is:
Homework Equations
I think it is...
Homework Statement
A piece of metal of weight 50 grams is heated to a temperature of 100°C and then introduced into a calorimeter containing water at 14°C, the maximum temperature reached being 20°C. If the weight of the calorimeter is 5 grams, the specific heat of the metal of which it is...
Homework Statement
Ok, this is something related to a real life problem, more precisely a laboratory experiment.
Say that the temperature of the room is 25°C. I have a calorimeter. I chose to put 250 g of water at 27.5 °C inside it. But as it is not a perfect calorimeter, say I've...
Homework Statement
A 34 g block of ice is cooled to -75°C. It is added to 562 g of water in an 80 g copper calorimeter at a temperature of 22°C. Find the final temperature. (The specific heat of copper is 387 J/kg ·°C and the specific heat of ice is 2090 J/kg ·°C. The latent heat of fusion...
Homework Statement
A copper calorimeter can with mass 0.100 kg contains 0.160 kg of water and 0.018 kg of ice in thermal equilibrium at atmospheric pressure.
Homework Equations
If 0.750 kg of lead at a temperature of 255 C is dropped into the calorimeter can, what is the final...
Homework Statement
I have a lab report due next week and I'm almost done with it. However I'm totally stuck on the last part where it is wrote in a description of the experience : c=\frac{(m+M_e)(T_f'-T'_i)}{m(T_c-T_f)} where c is the specific heat of a metal. If I work out the units in the...
im doing a calorimeter experiment and need to find the specific heat capacity of the calorimeter, but always gets a negative answer.
Initial temp = 23 C
Final temp = 60 C
Change in temp = 37 C
Mass of calorimeter = 0.027645kg
Mass of water = 0.1kg
Specific heat capacity water = 4200...
Homework Statement
A clock is designed with a simple pendulum, consisting of a mass at the end of an aluminum rod, whose period is supposed to be equal to one second. The clock is designed to keep accurate time at 20.0°C, but is operated at a constant temperature of −80.0°C. (a) Will the...
Homework Statement
I've stumped myself on what (I think) should be a very easy problem. I'm trying to come up with an expression for the temperature of a small amount of water as heat is added at a constant rate. The water is partially exposed to open air, so can lose energy to the...
Homework Statement
A copper calorimeter with mass 0.1 kg contains 0.15 kg of water and 0.012 kg of ice in their equilibrium at normal atmospheric pressure(0 degrees Celsius). If 0.5 kg of lead at 200 Celsius is dropped in calorimetr, what is the final temperature?( consider the close system...
Homework Statement
A copper calorimeter can with mass 0.100 kg contains 0.160 kg of water and 0.018 kg of ice in thermal equilibrium at atmospheric pressure.
If 0.750 kg of lead at a temperature of 255^{o}C is dropped into the calorimeter can, what is the final temperature? Assume that no...
Homework Statement
A copper calorimeter can with mass 0.100 kg contains 0.160 kg of water and 0.018 kg of ice in thermal equilibrium at atmospheric pressure.
If 0.750 kg of lead at a temperature of 255^{o}C is dropped into the calorimeter can, what is the final temperature? Assume that no...
Question
A copper calorimeter can with mass 0.100 kg contains 0.160 kg of water and 0.018 kg of ice in thermal equilibrium at atmospheric pressure.
If 0.750 kg of lead at a temperature of 255 degrees C is dropped into the calorimeter can, what is the final temperature? Assume that no heat...