First slide

Gibb's Helmholtz equation

Question

Which of the following situation will need low temperature for a reaction become spontaneous?

Easy

A

$∆ S +, ∆ H +$
B

$∆ S -, ∆ H -$
C

$∆ S +, ∆ H -$
D

$∆ S -, ∆ H +$

Solution

Let, $∆ S = + x and ∆ H = - y$
$∆ G = - y - T (- x) = - y + Tx$
Decrease in temperature will make $∆ G < 0$ negative for spontaneity.

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