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typically you will be given values for the heat necessary/released by each when it is created (H2O and CO2) and when its used (C3H8).. then balance the equation and multiply the coefficients by energy used for each element, then subtract one side from the other to get an answer... remember 02 will not have an amount of KJ released.

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13y ago
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Q: What is the enthalpy change for 5O2 plus C3H8 to 3CO2 plus 4H2O?
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