First slide

2nd Law of Thermodynaimcs

Question

For the reaction $2 H (g) \to H_{2} (g)$ , the correct relation is

Easy

A

$ΔH > 0, ΔS > 0$
B

$ΔH > 0, ΔS < 0$
C

$ΔH < 0, ΔS < 0$
D

$ΔH < 0, ΔS > 0$

Solution

Number of moles are decreasing, $ΔS < 0$
Bond formation is always exothermic, $ΔH < 0$

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