Heat of combustion of carbon monoxide at constant volume and at 17° C is -67,710 cal. The heat of combustion at constant pressure is

Question

Heat of combustion of carbon monoxide at constant volume and at 17° C is -67,710 cal. The heat of combustion at constant pressure is (A) -68,000 cal (B) -67,800 cal (C) -67,050 cal (D) +68,500 cal

Tardigrade Admin · Accepted Answer

CO (g)+(1/2) O 2(g) arrow CO 2(g) Δ H=Δ E+Δ n R T Δ H=-67,710-(1/2) × 2 × 290 =-68000 cal

Q. Heat of combustion of carbon monoxide at constant volume and at $1 7^{\circ} C$ is $- 67, 710 c a l$ . The heat of combustion at constant pressure is

-68,000 cal

-67,800 cal

-67,050 cal

+68,500 cal

$CO (g) + \frac{1}{2} O_{2} (g) \to C O_{2} (g)$
$Δ H = Δ E + Δ n RT$
$Δ H = - 67, 710 - \frac{1}{2} \times 2 \times 290$
$= - 68000 c a l$

Q. Heat of combustion of carbon monoxide at constant volume and at 17∘C is −67,710cal. The heat of combustion at constant pressure is