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Determine which of the following reactions
P taking place at constant pressure represent

W surrounding that do work on the system environment?
I. \( 4 \mathrm{NH}_{3}(g)+7 \mathrm{O}_{2}(g) \rightarrow 4 \mathrm{NO}_{2}(g)+6 \mathrm{H}_{2} \mathrm{O}(g) \)
II. \( \mathrm{CO}(g)+2 \mathrm{H}_{2}(g) \rightarrow \mathrm{CH}_{2} \mathrm{OH}(l) \)
III. \( \mathrm{C}(s \),graphite \( )+\mathrm{H}_{2} \mathrm{O}(g) \rightarrow \mathrm{CO}(g)+\mathrm{H}_{2}(g) \)
IV. \( \mathrm{H}_{2} \mathrm{O}(s) \rightarrow \mathrm{H}_{2} \mathrm{O}(l) \)
(1) III, IV
(2) II and III
(3) II, IV
(4) I and II, IV
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