The complete combustion of one mole of benzene produces grams of carbon dioxide.

Benzene has the molecular formula of ${\mathrm{C}}_6{\mathrm{H}}_6$.

Combustion reaction of benzene :-

${\mathrm{C}}_6{\mathrm{H}}_6 + \frac{15}{2}{\mathrm{O}}_2 \to 6{\mathrm{CO}}_2 +3{\mathrm{H}}_2\mathrm{O}$

By the reaction, we can see that one mole of benzene on combustion gives the six mole of carbondioxide and three moles of water.

Mole of carbondioxide = $6$

Molar mass of carbondioxide = $44 \mathrm{g}/\mathrm{mol}$

Given mass of the carbondioxide = $\mathrm{mole}\times \mathrm{molar} \mathrm{mass}=6\times 44=264 \mathrm{g}$

Hence, the complete combustion of one mole of benzene produces $264$ grams of carbon dioxide.