Question

An alternative approach to bomb calorimetry is toestablish the heat capacity of the calorimeter, exclusive of the water it contains. The heat absorbed by the water and by the rest of the calorimeter must be calculated separately and then added together.

A 1.148g sample of benzoic acid is burned in excess o2 in a bomb immersed in 1181 g of water. Thetemperature of the water rises from 24.96 to 30.25C. The heat ofcombustion of benzoic acid is -26.42 kj/g.

In a second experiment,a 0.895g powdered coal sample is burned in the same calorimeter assembly. The temperature of 1162 g water rises from 24.98 to 29.81C. How many grams of this coal would have to be burned to release 2.15x10^9 kj of heat?

Please help I don't know where to start