The enthalpy change for a chemical reaction is the sumof the energy consumed in

Question

The enthalpy change for a chemical reaction is the sumof the energy consumed in breaking bonds and the energy released during bond formation. One way to determine the overall energy change for a chemical reaction is to apply Hess's law to add together a group of reactions which can be arranged such that the chemical equations, when combined. give the overall equation we are trying to characterize. 2nd attempt Part 1 (0.3 point) i See Periodic Table See Hint Write a balanced chemical equation for the combustion of gaseous propane in gaseous oxygen to produce gaseous carbon dioxide and liquid water. Part 2 (0.3 point) See Hint Combine the following equations to determine the enthalpy change for the combustion of 1 mole of propane. Assume that solid carbon is graphite. C(sgraphite)+4H2(8) CH) AHo--1038 kJ/mol C(s.graphite) +02)CO2() AHo--393.5 kJ/mol AHo--285.8 kJ/mol 2219.9 /mol Part 3 (0.3 point) See Hint The average propane cylinder for a residential grill holds approximately 18 kg of propane. How much energy (in kJ) is released by the combustion of 13.50 kilograms of propane in sufficient oxygen? kl

Explanation / Answer

1 mole (44g) of propane on combustion releases 2219.9 KJ of energy (delta H combustion= -2219.9 KJ/mol)

The energy released by the combustion of 15.6 kg=15600 g of propane in sufficient oxygen is= (15600/44)*(2219.9) KJ

=> 7.87*10^5 KJ of energy is released.

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