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What is the enthalpy change when 100.0 g octane (C8H18, MW = 114.23 g/mol) is combusted at 25C?

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2C8H18 + 50O2 --> 16CO2 + 18H2O
dHrxn = (n*dHo products) - (n*dHo reactants)
dHo for CO2 and H2O are available from tables in your text or online. dHo for O2 = 0. Post your work if you get stuck.

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