HARDMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryThermodynamics and ThermochemistryAchiever Section
Consider the reaction below at 298 K: C (graphite) + 2H₂ (g) → CH₄ (g) →fHº (kJ/mol) – 74.9 S₀ m(J/K/mol + 5.6 + 130.7 Which statement below is correct ?
A.rG0 is – 50.8 kJ and the reaction is driven by✓ Correct
B.rG0 is – 50.8 kJ and the reaction is driven by
C.rG0 is + 50.8 kJ and the reaction is driven by
D.rG0 is – 50.8 kJ and the reaction is driven by
Explanation
graphite 2H CH 2 g 4 g → o o o o m m 4 m m 2(g) S S (CH ) S (graphite) 2S (H ) 186.3 5.6 2 130.7 180.7 261.4 80.7 We know, G H T S 74.9 kJ 298 80.7 J 74900 24048.6 50.8 kJ
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