calculate the standard molar enthalpy of formation delta H degree f of N2H4(g) f

Question

calculate the standard molar enthalpy of formation delta H degree f of N2H4(g) from the following information:
N2(g) + 2H2(g) --> N2H4(l) deltaH degree rxn= +50.6 kJ
N2H4(g) --> N2H4(l) deltaH degree rxn = -44.8kJ

Explanation / Answer

A.] 2CH4(g) => C2H6(g) + H2(g) First make sure it is a balanced reaction, and it is. Next look up the standard enthalpy of formation (at 25 degrees C) for each compound in the reaction using the websites below: Delta Hf for CH4(g) = - 74.9 kJ/mole Delta Hf for C2H6(g) = - 83.8 kJ/mole Delta Hf for H2(g) = 0.0 kJ/mole Note: You have to make sure the state of each compound (solid, liquid or gas) from the table is what you want, because it makes a difference.

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