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Question

The following reaction is performed at 298 K.
2NO(g)+O22NO2(g)
The standard free energy of formation of NO(g) is 86.6 kJ/mol at 298 K. What is the standard free energy of formation of NO2(g) at 298K?(Kp=1.6×1012)

A
R(298)ln(1.6×1012)86600
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B
86600 + R(298) ln(1.6 ×1012)
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C
866600 - ln(1.6×1012)R(298)
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D
0.5[2×86600R(298)ln(1.6×1012)]
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Solution

The correct option is D 0.5[2×86600R(298)ln(1.6×1012)]
GRxn=2GNO22GNO
GNO2=GNO+12GRx
=GNO+12(RT lne Kp)
=0.5[2×86000R(298)lne(1.6×1012)]

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