Question

At the beginning of the summer, the 70.0 m³ of water in a back-yard swimming pool must be heated from 4.87 ^oC to 26.4 ^oC. The heat is supplied from a natural gas fired heater and the efficiency of transferring the heat from the combustion reaction to the water is 65%.

The mass (in kg) of methane that must be burned to cause this temperature change in the water? (The enthalpy of combustion of methane is -803 kJ mol^-1.) is 193.4 kg.

The heater generates 30.0 kW of power. How long (in hours) will the heating require?

Answer 1