please do it step by step

Suppose you have a bomb calorimeter and first calibrate it using a known quantity of electrical heat (q=current*voltage*time), thus providing known values for q and AT. Next (using the same device), you measured the combustion of 1 mole of methane, CHA(g) + 2 O2(g) CO2(g) + 2 H2O(1), resulting in a known value of ATc and assuming a perfect gas. Explain with equations and words (be specific), how you would obtain the molar enthalpy of combustion (AcHm ) from this data. Oxygen input Firing leads Thermometer Sample Bomb Oxygen under pressure Water