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MCAT Question of the Day

The combustion of octane is a common reaction in automobile engines.

1) 2 C8H18 (l) + 25 O2 (g) à 16 CO2 (g) + 18 H2O (g) ΔH1 = -250 kJ/mole

2) 18 H2O (l) à 18 H2O (g) ΔH2 = 88 kJ/mole

Net Reaction:

3) 2 C8H18 (l) + 25 O2 (g) à 16 CO2 (g) + 18 H2O (l) ΔH3 = ?



Given ΔH1 and ΔH2, what is ΔH3 for the net reaction above?

A. 163 kJ/mole

B. -163 kJ/mole

C. 333 kJ/mole

D. -333 kJ/mole


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