Question

A certain chemical reaction releases of heat energy per mole of reactant consumed. Suppose some moles of the reactant are put into a calorimeter (a device for measuring heat flow). It takes of heat energy to raise the temperature of this calorimeter by . Now the reaction is run until all the reactant is gone, and the temperature of the calorimeter is found to rise by . How would you calculate the number of moles of reactant that were consumed?

Answer 1

To relate the quantity of a substance to the amount of heat transferred and heat capacity, temperature, number of moles is given by

q=ncpΔT

where

n is number of moles

cp is molar heat capacity

ΔT=Tfinal−Tinitial is the temperature difference