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Q.

ΔGfo of NH3(g),NO(g),H2O(l) respectively are -108,+104 and -237 kJ/mol. Then ΔGf0 for

4NH3(g)+5O2(g)4NO(g)+6H2O(l)

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a

+574 kJ

b

-574 kJ

c

+287 kJ

d

Zero

 

answer is B.

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Detailed Solution

For a given reaction,

4NH3(g)+5O2(g)4NO(g)+6H2O(l) ΔGsys=4ΔGNO+6ΔGH2O-5ΔGO2-4ΔGNH3 ΔGsys=4(104)+6(-237)-5(0)-4(-108) ΔGsys=416-1422-0+432 ΔGsys=-574 kJ

Hence, option (B) is correct.

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ΔGfo of NH3(g),NO(g),H2O(l) respectively are -108,+104 and -237 kJ/mol. Then ΔGf0 for4NH3(g)+5O2(g)→4NO(g)+6H2O(l)