When ethyne is passed through a red hot tube, | vedclass

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(C) The reaction for the trimerisation of ethyne to benzene is:$3C_2H_{2(g)} 	o C_6H_{6(g)}$The standard heat of reaction $(\Delta H_{r}^o)$ is calcu

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$-605$

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(C) The reaction for the trimerisation of ethyne to benzene is:$3C_2H_{2(g)} 	o C_6H_{6(g)}$The standard heat of reaction $(\Delta H_{r}^o)$ is calculated using the formula:$\Delta H_{r}^o = \sum \Delta H_{f(	ext{products})}^o - \sum \Delta H_{f(	ext{reactants})}^o$$\Delta H_{r}^o = \Delta H_{f(C_6H_6)(g)}^o - 3 	imes \Delta H_{f(C_2H_2)(g)}^o$Substituting the given values:$\Delta H_{r}^o = 85 - 3(230)$$\Delta H_{r}^o = 85 - 690$$\Delta H_{r}^o = -605 \ kJ \ mol^{-1}$

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When ethyne is passed through a red hot tube,the formation of benzene takes place :-$\Delta H_{f(C_2H_2)(g)}^o = 230 \ kJ \ mol^{-1}$$\Delta H_{f(C_6H_6)(g)}^o = 85 \ kJ \ mol^{-1}$Calculate the standard heat of trimerisation of ethyne to benzene.$3C_2H_{2(g)} \to C_6H_{6(g)}$......$kJ \ mol^{-1}$