Combustion reactions are exothermic. The heat of reaction for the combustion of cyclopentane, C;H10, is 786.6 kcal/mol. What is the heat of combustion for cyclopentane in kcal/gram? kcal/gram How much heat will be given off if molar quantities of cyclopentane react according to the following equation? 2 C5H10 + 15 O2- →10 CO2 + 10 H2O kcal Submit Answer Retry Entire Group 9 more group attempts remaining

Combustion reactions are exothermic. The heat of reaction for the combustion of cyclopentane, C;H10, is 786.6 kcal/mol. What is the heat of combustion for cyclopentane in kcal/gram? kcal/gram How much heat will be given off if molar quantities of cyclopentane react according to the following equation? 2 C5H10 + 15 O2- →10 CO2 + 10 H2O kcal Submit Answer Retry Entire Group 9 more group attempts remaining

Living By Chemistry: First Edition Textbook

1st Edition

ISBN:9781559539418

Author:Angelica Stacy

Publisher:Angelica Stacy

ChapterU5: Fire: Energy , Thermodynamics, And Oxidation-reduction

SectionU5.10: Fuelish Choices: Heat Of Combustion

Problem 5E

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How much heat is produced if 8.0 moles of ethane undergo complete combustion?The heat of combustion for ethane, C2H6, is 45.7 kJ/g.
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Since the heat of reaction is negative, why isn't the heat of reaction negative for octane, too? Is it because the heat of reaction for octane is before the reaction takes place, and hence before the release of heat? Is this the reason why octane's heat is positive, while the reaction as a whole is negative? Because it must have to do with the conservation of energy. Perhaps the reaction is the system, and octane is part of the surroundings, hence the opposite signs?
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