At 25$^\circ$C and 1 atm pressure, the enthalpy of combustion of benzene (I) and acetylene (g) are $-$ 3268 kJ mol$-$1 and $-$1300 kJ mol$-$1, respectively. The change in enthalpy for the reaction 3 C2H2(g) $\to$ C6H6 (I), is :

Question

At 25$^\circ$C and 1 atm pressure, the enthalpy of combustion of benzene (I) and acetylene (g) are $-$ 3268 kJ mol^$-$1 and $-$1300 kJ mol^$-$1, respectively. The change in enthalpy for the reaction 3 C₂H₂(g) $\to$ C₆H₆ (I), is :

+324 kJ mol^$-$1

+632 kJ mol^$-$1

$-$ 632 kJ mol^$-$1

$-$ 732 kJ mol^$-$1

Solution

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