Hydrazine, N2H4 is used as rocket fuels. The thermochemical equations for the combustion of hydrazine is N2H4  + O2→ N2 + 2H2O   ∆H = -622.4 KJ What quantity of heat is liberated by the combustion of 1 g of N2H4 ? Select one: a. 19.42 b. 18.42 c. 16.42 d. 15.42

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