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Q.

At $727^{\circ} C$ , entropy of universe is $90 J k^{- 1} m o l e^{- 1}$ . $Δ G$ of the system will be

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a

$- 90 J m o l e^{- 1}$

b

$90 J m o l e^{- 1}$

c

$90 k J m o l e^{- 1}$

d

$- 90 k J m o l e^{- 1}$

answer is B.

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Detailed Solution

$Δ G_{s y s} = - T Δ S_{t o t a l}$

$= - 1000 K (90 J K^{- 1} m o l e^{- 1})$

$= - 90 k J m o l e^{- 1}$

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At 727∘C, entropy of universe is 90 Jk−1 mole−1. ΔG of the system will be