Which one of the following reactions would produce the largest amount of heat per mole of oxygen? A.2O2(g) + CH4(g) à CO2(g) + 2H2O(g) ΔH°rxn = -802 kJ B.All reactions produce the same energy per mole of oxygen C.O2(g) + 2Ca(s) à 2CaO(s) ΔH°rxn = -635 kJ D.3O2(g) + 2CH3OH(l) à 2CO2(g) + 4H2O(g) ΔH°rxn = -1280 kJ

For reaction (A): 2O2 (g) + CH4 (g) → CO2 (g) + 2H2O (g) The enthalpy change is: ∆H⁰rxn = -802 kJ But, the moles of oxygen reacted are = 2 mol Hence, heat energy produced per mole of oxygen ∆H⁰rxn = -802 kJ/2 mol = -401 kJ/mol For reaction (C): O2 (g) + 2Ca (s) →2CaO(s) The enthalpy change is: ∆H⁰rxn = -635 kJ The moles of oxygen reacted are = 1 mol Hence, heat energy produced per mole of oxygen ∆H⁰rxn = -635 kJ/1 mol = -635 kJ/mol For reaction (D): 3O2 (g) + 2CH3OH(l) → 2CO2 (g) + 4H2O (g) The enthalpy change is: ∆H⁰rxn = -1280 kJ But, the moles of oxygen reacted are = 3 mol Hence, heat energy produced per mole of oxygen ∆H⁰rxn = -1280 kJ/3 mol = -426.66 kJ/molNow, comparing all the three reactions, for heat enrgy produced per mole of oxygen as: ( C) -635 kJ/mol > (D) -426.66 kJ/mol > (A) -401 kJ/mol Hence, the largest heat energy released is for reaction (C).

Answered: Which one of the following reactions…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

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	A.	2O_2(g) + CH_4(g) à CO_2(g) + 2H₂O_(g) ΔH°_rxn = -802 kJ
	B.	All reactions produce the same energy per mole of oxygen
	C.	O_2(g) + 2Ca_(s) à 2CaO_(s) ΔH°_rxn = -635 kJ
	D.	3O_2(g) + 2CH₃OH_(l) à 2CO_2(g) + 4H₂O_(g) ΔH°_rxn = -1280 kJ