Question

Determine which of the following reaction at constant pressure represent systems that do work on the surrounding environment
(I) `CaO (s) + CO_(2) (g) rarr CaCO_(3) (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 & III
D. I and II

Answer 1

Correct Answer - C
I. `Delta n - ve`, II `Delta n + ve`, III `Delta n = +ve`