Ammonia (NH3) boils at -33 C; at this temperature it has a density of 0.81 g/cm3. The

Question:

Ammonia (NH3) boils at -33 °C; at this temperature it has a density of 0.81 g/cm3. The enthalpy of formation of NH3(g) is -46.2 kJ/mol, and the enthalpy of vaporization of NH3(l) is 23.2 kJ/mol. Calculate the enthalpy change when 1 L of liquid NH3 is burned in air to give N2(g) and H2O(g). How does this compare with ΔH for the complete combustion of 1 L of liquid methanol, CH3OH(l)? For CH3OH(l), the density at is 0.792 g / cm3, and ΔH°f = -239 kJ/mol.