The molar enthalpies of combustion of C_2H_{2 | vedclass

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Question

(C) The formation reaction for $C_2H_{2(g)}$ is: $2C_{(graphite)} + H_{2(g)} \longrightarrow C_2H_{2(g)}$Using the enthalpy of combustion data:$\Delta

Vedclass · Accepted Answer

$226$

Vedclass · Answer

(C) The formation reaction for $C_2H_{2(g)}$ is: $2C_{(graphite)} + H_{2(g)} \longrightarrow C_2H_{2(g)}$Using the enthalpy of combustion data:$\Delta H_f(C_2H_2) = [2 	imes \Delta H_c(C) + 1 	imes \Delta H_c(H_2)] - \Delta H_c(C_2H_2)$$\Delta H_f(C_2H_2) = [2 	imes (-394) + 1 	imes (-286)] - (-1300)$$\Delta H_f(C_2H_2) = [-788 - 286] + 1300$$\Delta H_f(C_2H_2) = -1074 + 1300 = +226 \ kJ \ mol^{-1}$

The molar enthalpies of combustion of $C_2H_{2(g)}$,$C_{(graphite)}$,and $H_{2(g)}$ are $-1300$,$-394$,and $-286 \ kJ \ mol^{-1}$,respectively. The standard enthalpy of formation of $C_2H_{2(g)}$ is ....... $kJ \ mol^{-1}$.

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