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  4. Δ H°comb of carbon is -x kJ mol-1. The standard formation of enthalpy of CO2(g) will be

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Q. $\Delta H^{\circ}_{comb}$ of carbon is$ -x\, kJ\, mol^{-1}$. The standard formation of enthalpy of $CO_2\left(g\right)$ will be

Thermodynamics

Solution:

$C\left(s\right)+O_{2}\left(g\right)\to CO_{2}\left(g\right)$
$\Delta H^{\circ}_{comb}=-x\, kJmol$
$-x=\Delta H^{\circ}\left(O_{2}\right)-\left(0+0\right)$
$\Delta H^{\circ}\left(O_{2}\right)=-x\, kJ/mol$