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$A + 2 B \to 3 C$ . In the given reaction the entropy values of A, B and C respectively are 55, 30 and 45 $J K^{- 1} m o l^{- 1}$ . The $Δ H$ value of the above reaction at 300 K is 20 K.J. Find $Δ G$ of the reaction $(i n K J)$

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Detailed Solution

$A + 2 B \to C$

$Δ S = 3 S_{c} - [S_{A} + 2 S_{B}] = (3 \times 45) - [55 + (2 \times 30)] = 135 - 115 = 20 J K^{- 1}$

$Δ H = 20 K J = 20000$ Joules

$Δ G = Δ H - T Δ S = 20000 - 300 \times 20 = 14000 / 1000 = 14 K J$

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