What is the heat capacity of the calorimeter, Calorimeter, (in kJ/oC) of a bomb calorimeter if burning 1.0 g of benzoic acid in it causes the temperature to rise by 7.25 oC? Given ΔHcomb = LaTeX: -−26.38 kJ/g.

Answer Choices:

3221.53

3.64

191.26

25.34

-3.64

The heat capacity of calorimeter is 3.64 kJ/°C

Explanation:

To calculate the heat released, we use the equation:

where,

q = amount of heat released = ? kJ

m = mass of benzoic acid = 1.0 grams

= enthalpy change of the reaction = -26.38 kJ/g

Putting values in above equation, we get:

Heat released by the reaction will be equal to the heat absorbed by the calorimeter

Sign convention of heat:

When heat is absorbed, the sign of heat is taken to be positive and when heat is released, the sign of heat is taken to be negative.

To calculate the heat absorbed by the calorimeter, we use the equation:

where,

q = heat absorbed = 26.38 kJ

c = heat capacity of calorimeter = ? kJ/°C

= change in temperature = 7.25°C

Putting values in above equation, we get:

Hence, the heat capacity of calorimeter is 3.64 kJ/°C

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the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.