Styrene, C₈H₈, Is One of the Substances Used in the Production

Multiple Choice

Styrene, C₈H₈, is one of the substances used in the production of synthetic rubber. When styrene burns in oxygen to form carbon dioxide and liquid water under standard-state conditions at 25 ^$\circ$ C, 42.62 kJ are released per gram of styrene. Find the standard enthalpy of formation of styrene at 25 ^$\circ$ C.(Given: $\Delta$ H ^$\circ$ _f[CO₂(g) ] = -393.5 kJ/mol, $\Delta$ H ^$\circ$ _f[H₂O(l) ] = -285.8 kJ/mol, $\Delta$ H ^$\circ$ _f[H₂O(g) ] = -241.8 kJ/mol)

A) 147.8 kJ/mol
B) 323.8 kJ/mol
C) ~636.7 kJ/mol
D) ~4249 kJ/mol
E) ~8730 kJ/mol