Question

For which of the following changes, ∆H≠∆U
(a) N₂ (g) + O₂ (g) → 2NO(g)
(b) H₂(g)+ Cl₂(g) → 2HCl(g)
(c) C(s)+ O₂(g) → CO₂(g)
(d) CaCO₃(s) → CaO(s) + CO₂ (g)

Answer 1

For which of the following changes, ∆H≠∆U

(a) N₂ (g) + O₂ (g) → 2NO(g)

(b) H₂(g)+ Cl₂(g) → 2HCl(g)

(c) C(s)+ O₂(g) → CO₂(g)✔️✔️

(d) CaCO₃(s) → CaO(s) + CO₂ (g)

Answer 2

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(c) C(s)+ O₂(g) → CO₂(g)