# Determine which of the following reactions at constant pressure represent surrounding that do work on the system environment : (P) 4NH_(3)(g) + 7O_(2

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Determine which of the following reactions at constant pressure represent surrounding that do work on the system environment :
(P) 4NH_(3)(g) + 7O_(2)(g) to 4 NO_(2)+ 6H_(2)O(g)
(Q) CO.O(g)+ 2H_(2)(g) to CH_(3)OH(l)
(R) C("s,graphite")+H_(2)O(g) to CO(g)+H_(2)(g)
(S) H_(2)O(s) to H_(2)O(l)`
A. III,IV
B. II and III
C. II,IV
D. I and II,IV

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