The enthalpy of combustion of benzoic acid (c6h5cooh) which is often used to calibrate calorimeters, is −3227 kj/mol. when 1.09 g of benzoic acid was burned in a calorimeter, the temperature increased by 3.662◦c. what is the overall heat capacity of the calorimeter? the overall heat capacity includes the calorimeter hardware and the water that is in it. answer in units of kj/ ◦c.

Answer : The heat capacity of the bomb calorimeter

Explanation :

First we have to calculate the heat released by the combustion.

where,

q = heat released by combustion = ?

n = moles of benzoic acid =

= enthalpy of combustion = 3227 kJ/mole

Now put all the given values in the above formula, get:

Now we have to calculate the heat capacity of the bomb calorimeter.

Heat released by the reaction = Heat absorbed by the calorimeter

where,

q = heat released by the reaction  = 28.8 kJ = 28800 J

= heat capacity of calorimeter = ?

= change in temperature =

Now put all the given values in the above formula, we get:

Therefore, the heat capacity of the bomb calorimeter

chemical energy is stored in the chemical bonds of atoms and molecules. it can only be seen when it is released in a chemical reaction. when chemical energy is released, the substance from which the energy came is often changed into an entirely different substance.

this chemical reaction releases energy in the form of light and heat. chemical energy is the potential energy stored in the arrangement of atoms within molecules. breaking chemical bonds requires energy, while forming new chemical bonds releases energy.

the atp molecule can store energy in the form of a high energy phosphate bond joining the terminal phosphate group to the rest of the molecule. in this form,energy can be stored at one location, then moved from one part of the cell to another, where it can be released to drive other biochemical reactions.