Hydrazine,N 2 H 4 , is a liquid used as a rocket fuel. Itreacts with oxygen to y

Question

Hydrazine,N2H4, is a liquid used as a rocket fuel. Itreacts with oxygen to yield nitrogen gas and water.
       N2H4(l) + O2(g)® N2(g) + 2H2O(l)
The reaction of 3.60 g of N2H4 evolves 69.8kJ of heat. Calculate the enthalpy change per mole of hydrazine forthe above reaction. The answer is -621 kJ just having a little trouble gettingthere, any help is appreciated. Hydrazine,N2H4, is a liquid used as a rocket fuel. Itreacts with oxygen to yield nitrogen gas and water.
       N2H4(l) + O2(g)® N2(g) + 2H2O(l)
The reaction of 3.60 g of N2H4 evolves 69.8kJ of heat. Calculate the enthalpy change per mole of hydrazine forthe above reaction. The answer is -621 kJ just having a little trouble gettingthere, any help is appreciated.

Explanation / Answer

N2H4(l) +  O2(g)   ------>  N2(g)   +  2H2O(l) Molar mass of hydrazine = 32.05 g/mol Moles of hydrazine = Mass / molar mass                               =3.60 g / 32.05 g/mol                               =0.1123 mol So enthalpy change per mole of hydrazine = 69.8 kJ / 0.1123mol                                                                 ˜621 kJ

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