Kumail A.

asked • 04/10/21

Hess's Law of Heat Summation

Liquid hydrazine, N2H4(l), is a rocket fuel. It combusts in oxygen gas to form nitrogen gas and liquid water:

N2H4(l) + O2(g) -> N2(g) + 2H2O(l)

Use the following thermochemical equations to calculate the enthalpy change for the combustion of liquid hydrazine:

2NH3(g) + 3N2O(g) -> 4N2(g) + 3H2O(l) ΔH = -1010kJ

N2O(g) + 3H2(g) -> N2H4(l) + H2O(l) ΔH = -317kJ

2NH3(g) + 0.5O2(g) -> N2H4(l) + H2O(l) ΔH = -143kJ

H2(g) + 0.5O2(g) -> H2O(l) ΔH = -286kJ

1 Expert Answer


Peter M.

Same answer I got. I thought I had over complicated it so wanted to confirm on the internet. Thank you for posting.


Still looking for help? Get the right answer, fast.

Ask a question for free

Get a free answer to a quick problem.
Most questions answered within 4 hours.


Find an Online Tutor Now

Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.