Benzene is a natural constituent of crude oil and is one of the elementary petrochemicals. Scientists have recently

developed a novel route for the efficient production of Benzene from biomass. Benzene $(C_6{H}_6)$ used in the

manufacturing of plastics and is a carcinogen affecting the bone marrow. Long$-$term exposure has been shown to

cause leukemia and other blood disorders.

$($a$)$ Write a complete combustion equation of benzene

$($b$)$ Calculate the heat of formation of benzene.