Styrene (C8H8, FW 104.15) 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°C, 42.62 kJ are released per gram of styrene. Find the standard enthalpy of formation of styrene at 25°C. (Given: Hf°[CO2(g)] = –393.5 kJ/mol, Hf°[H2O(l)] = –285.8 kJ/mol, Hf°[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

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Styrene (C8H8, FW 104.15) 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°C, 42.62 kJ are released per gram of styrene. Find the standard enthalpy of formation of styrene at

25°C.

(Given: Hf°[CO2(g)] = –393.5 kJ/mol, Hf°[H2O(l)] = –285.8 kJ/mol,

Hf°[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

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