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Determine which of the following reactions at constant pressure represent surrounding that do work on the system environment 

I. 4NH3(g) + 7O2(g) → 4NO2(g) + 6H2O(g) 

II. CO(g) + 2H2(g) → CH3OH(l) 

III. C(s, graphite) + H2O(g) CO(g) + H2(g) 

IV. H2O(s) → H2O(l) 

a. III, IV b. II and III c. II, IV d. I and II, IV 

1 Answer

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Correct option (D) I and II, IV


W = -PextΔV = - ΔngRT and Δng is –ve for I and II also ΔV = -ve for IV (on contraction surrounding does work on surrounding).

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