The heat of combustion of ethanol into carbon dioxides and water is �

1.	The heat of combustion of ethanol into carbon dioxides and water is –327 kcal at constant pressure. The heat evolved (in cal) at constant volume and 27°C (if all gases behave ideally) is (R = 2 cal mol–1 K–1)
Answer» C₂H₅OH_(l)+ 3O₂(g) → 2CO_2(g) + 3H₂O_(l) Δn_g = 2 – 3 = –1 Δ_cH = Δ_cU + (Δn_g) RT Δ_cH = Δ_cU – RT ΔcU = Δ_cH + RT = –327 × 10³+ 2 × 300 = –326400 cal. Heat evolved = 326400 cal.

The heat of combustion of ethanol into carbon dioxides and water is –327 kcal at constant pressure. The heat evolved (in cal) at constant volume and 27°C (if all gases behave ideally) is (R = 2 cal mol–1 K–1)

Answer»

C₂H₅OH_(l)+ 3O₂(g) → 2CO_2(g) + 3H₂O_(l)

Δn_g = 2 – 3 = –1

Δ_cH = Δ_cU + (Δn_g) RT

Δ_cH = Δ_cU – RT

ΔcU = Δ_cH + RT

= –327 × 10³+ 2 × 300

= –326400 cal.

Heat evolved

= 326400 cal.

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The heat of combustion of ethanol into carbon dioxides and water is –327 kcal at constant pressure. The heat evolved (in cal) at constant volume and 27°C (if all gases behave ideally) is (R = 2 cal mol–1 K–1)

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