N2H4(g) + H2(g) ---> 2 NH3(g) H1 = â€“1876 kJ

3 H2(g) + N2(g) ---> 2 NH3(g) H2 = â€“922 kJ

The H f for the formation of hydrazine: 2 H2(g) + N2(g) N2H4(g) will be _________ kJ/ mol.

1 answer

Use Hess' Law.

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