First slide

Hydrogen

Question

A process is non-spontaneous at all temperatures when

Difficult

A

$ΔH = - 60 kJ, ΔS = + 30 kJ$
B

$ΔH = + 54 kJ, ΔS = + 63 kJ$
C

$ΔH = - 30 kJ, ΔS = - 45 kJ$
D

$ΔH = + 21 kJ, ΔS = - 12 kJ$

Solution

Option 4…… $ΔH = + ve; ΔS = - ve,$ the process is non-spontaneous at all temperatures.
$ΔG = ΔH - TΔS$
$ΔG = + ve - T (- ve)$
$ΔG = + ve$

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