A particular natural gas consists, in mole percents, of 83.0% CH 4 , 11.2% C 2 H

Question:

A particular natural gas consists, in mole percents, of 83.0% CH₄, 11.2% C₂H₆, and 5.8% C₃H₈. A 385 L sample of this gas, measured at 22.6 °C and 739 mmHg, is burned at constant pressure in an excess of oxygen gas. How much heat, in kilojoules, is evolved in the combustion reaction?

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