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Determine which of the following reactio...

Determine which of the following reactions at constant pressure represent systems that do work on the surrounding environment
I. `Ag^(+) (aq) + Cl^(-) (aq) rarr AgCl(s)` II. `NH_(4)Cl(s) rarr NH_(3) (g) + HCl (g)`
III. `2NH_(3)(g) rarr N_(2)(g) + 3H_(2)(g)`

A

I

B

III

C

II and III

D

I and II

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