Classify the following reaction according to work done by the system, on the system and no work done of pressure is constant.
(a) $H_{2} (g) + {C l}_{2} (g) ⟶ 2 H C I (g)$
(b) $30_{2} (g) ⟶ 20_{3} (g)$
(c) ${2 S O}_{2} (g) + O_{2} (g) ⟶ {2 S O}_{3} (g)$
(d) ${N H}_{4} {N O}_{3} (s) ⟶ N_{2} O (g) + 2 H_{2} O (g)$

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Solution

$W = - △ n R T \Rightarrow$ if $△ n = 0$ then $W = 0$
(a) $△ n = 2 - 2 = 0$
(b) $△ n = 2 - 3 = - 1$
(c) $△ n = 2 - 3 = - 1$
(d) $3 - 0 = 3$

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