The Δ Hf0 for CO2(.g.) , CO(.g.) and H2O(.g.) are -393.5 , -110.5 and -241.8kJmol- 1 respectively. The standard enthalpy changes (.inkJ.) for the reaction CO2(g)+H2(g) arrow CO(g)+H2O(.g.) is:

Question

The Δ Hf0 for CO2(.g.) , CO(.g.) and H2O(.g.) are -393.5 , -110.5 and -241.8kJmol- 1 respectively. The standard enthalpy changes (.inkJ.) for the reaction CO2(g)+H2(g) arrow CO(g)+H2O(.g.) is: (A) 524.1 (B) 41.2 (C) -262.5 (D) -41.2

Tardigrade Admin · Accepted Answer

Δ Hr e a c t i o n° =Δ Hf° (C O)+Δ Hf° (H2 O , g)-Δ Hf° (C O2 , g)=-110.5-241.8+393.5=41.2

Q. The $Δ H_{f}^{0}$ for $C O_{2} (g)$ , $CO (g)$ and $H_{2} O (g)$ are $- 393.5$ , $- 110.5$ and $- 241.8 k J m o l^{- 1}$ respectively. The standard enthalpy changes $(ink J)$ for the reaction
$C O_{2} (g) + H_{2} (g) \to CO (g) + H_{2} O (g)$ is:

$524.1$

$41.2$

$- 262.5$

$- 41.2$

$Δ H_{re a c t i o n}^{^{\circ}} = Δ H_{f}^{^{\circ}} (CO) + Δ H_{f}^{^{\circ}} (H_{2} O, g) - Δ H_{f}^{^{\circ}} (C O_{2}, g) = - 110.5 - 241.8 + 393.5 = 41.2$

Q. The ΔHf0​ for CO2​(g) , CO(g) and H2​O(g) are −393.5 , −110.5 and −241.8kJmol−1 respectively. The standard enthalpy changes (inkJ) for the reaction CO2​(g)+H2​(g)→CO(g)+H2​O(g) is:

524.1

41.2

−262.5

−41.2