Question

b) The heat of combustion of carbon is 94 Cal/mol. What mass is converted to energy when one mole of carbon is burned? Express the mass loss as a percent of the initial mass.

Answer 1

           heat of combustion of carbon is 94 Cal/mol

           C + O2 ----------> CO2

       1 mol                                    heat of combustion = 94 Cal/mol

      12 g                                      94 Cal/mol

For carbon,

   1 mol = 12 g

Since, 1 mole of carbon is burned - no carbon left.

      Therefore,

            mass converted to energy = 12g

         mass loss = 100 %