15. A student places 50.0 g of acid solution and 50.0 g of base solution in a coffee cup calorimeter. The temperature change of the reaction is recorded as 6.81°C and the specific heat of the reaction is 4.12 J/g °C. How much heat (in kJ) was generated by the reaction?

17. How much energy (in kJ) could be produced from a filled 5.00gal tank of LP gas? (Assume all the LP gas in the tank is propane (C3H8) and that the propane has a density of 493 g/L).