Question

An average hot water tank will hold 300.0 L of water needs to be kept at 65.0 O C in order to
kill any bacteria in the water. If you are filling a new tank with water at a starting
temperature of 12.5 O C, what mass of natural gas (methane) must be burned in a complete
combustion reaction in order bring your tank up to the correct temperature?

Answer 1

$\Delta\Tau*C_ water*m_ water=\Delta H_r (entalpy) *\nu(CH_4)$

m(H2O)=Volume(H2O)*p=300kg

DT=-52,5*C

Hr=-802kJ/mole

Cwater=4,2kJ*C^-1*kg^-1

V(CH4)=82.5 moles