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1.
C2H8 + 4O2 -> 2 CO2 + 4H2O
deltaHf = [4(-241.8) + 2(-393.5)] - [4(0) + 1(-104.0)]
deltaHf = -1650.2 kJ

2.
deltaHf = 2(-393.5) - 1(-566.0)
deltaHf = -221 kJ
 
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sir peculiar

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