For the reaction,3 C_2 H_{2(g)} longrightarro | vedclass

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Question

(D) The standard enthalpy change of a reaction is calculated using the formula: $\Delta H_{rxn}^{\circ} = \sum \Delta H_f^{\circ} (	ext{products}) -

Vedclass · Accepted Answer

$-660 \ kJ \ mol^{-1}$

Vedclass · Answer

(D) The standard enthalpy change of a reaction is calculated using the formula: $\Delta H_{rxn}^{\circ} = \sum \Delta H_f^{\circ} (	ext{products}) - \sum \Delta H_f^{\circ} (	ext{reactants})$.For the reaction $3 C_2 H_{2(g)} \longrightarrow C_6 H_{6(g)}$,the expression is: $\Delta H_{rxn}^{\circ} = [1 	imes \Delta H_f^{\circ}(C_6 H_6)] - [3 	imes \Delta H_f^{\circ}(C_2 H_2)]$.Substituting the given values: $\Delta H_{rxn}^{\circ} = [1 	imes 90 \ kJ \ mol^{-1}] - [3 	imes 250 \ kJ \ mol^{-1}]$.$\Delta H_{rxn}^{\circ} = 90 \ kJ \ mol^{-1} - 750 \ kJ \ mol^{-1} = -660 \ kJ \ mol^{-1}$.

For the reaction,$3 C_2 H_{2(g)} \longrightarrow C_6 H_{6(g)}$,calculate the standard enthalpy change. The values of $\Delta H_f$ for $C_2 H_2$ and $C_6 H_6$ respectively are $250 \ kJ \ mol^{-1}$ and $90 \ kJ \ mol^{-1}$.

Similar Questions

In the reaction $H_2 + Cl_2 \rightarrow 2HCl$,heat is released. The bond energies of $H-H$ and $Cl-Cl$ are $430 \ kJ \ mol^{-1}$ and $242 \ kJ \ mol^{-1}$ respectively. If the enthalpy of reaction is $-182 \ kJ \ mol^{-1}$,the bond energy of $H-Cl$ is . . . . . . $kJ \ mol^{-1}$.

Consider the reactions:
$C_{(s)} + 2H_{2(g)} \to CH_{4(g)}, \Delta H = -x \ kcal$
$C_{(g)} + 4H_{(g)} \to CH_{4(g)}, \Delta H = -x_1 \ kcal$
$CH_{4(g)} \to CH_{3(g)} + H_{(g)}, \Delta H = +y \ kcal$
The bond energy of $C-H$ bond is:

For which of the following reactions will the value of $\Delta H$ be positive?

Calculate the enthalpy for the following reaction using the given bond energies $(kJ/mol)$:
$(C-H = 414; O-H = 463; H-Cl = 431; C-Cl = 326; C-O = 335)$
$CH_3OH_{(g)} + HCl_{(g)} \rightarrow CH_3Cl_{(g)} + H_2O_{(g)}$

What is meant by the term average bond enthalpy? Why is there a difference in the bond enthalpy of the $O-H$ bond in ethanol $(C_{2}H_{5}OH)$ and water $(H_{2}O)$?

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