# Problem: Ammonia (NH3) boils at -33oC; 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 4 L of liquid NH3 is burned in air to give N2(g) and H2O(g).

###### FREE Expert Solution

Reaction: 4 NH3(l) + 3 O2(g) → 2 N2(g) + 6 H2O(g)

97% (471 ratings) ###### Problem Details

Ammonia (NH3) boils at -33oC; 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 4 L of liquid NH3 is burned in air to give N2(g) and H2O(g).

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Enthalpy of Formation concept. You can view video lessons to learn Enthalpy of Formation. Or if you need more Enthalpy of Formation practice, you can also practice Enthalpy of Formation practice problems.