Part A Use the values of G f in Appendix B in the textbook to calculate the stan

Question

Part A

Use the values of Gf in Appendix B in the textbook to calculate the standard free-energy change for the synthesis of hydrazine from nitrogen and hydrogen.
N2(g)+H2(g)N2H4(l)

Express your answer using one decimal place and include the appropriate units.

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Part B

Is it possible to synthesize hydrazine from gaseous N2 and H2, each at 25 C and 1 atm pressure?

Is it possible to synthesize hydrazine from gaseous  and , each at 25  and 1  pressure?

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~ I thought the answer for the first one was 159.3 kj/mol, but it is not correct. What am I doing wrong?

Explanation / Answer

Part A : The standard free energy change for N2H4 is dGof = +149 kJ/mol

Part B : As the free energy change for the process is +ve, it is not spontaneous at normal temperature and pressure. Thus it is not possible to synthesize N2H4 from gaseous N2 and H2 at 25 oC.

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