Which of CH4(g), C2H2(g), and CH3OH(l) provides the most heat per gram upon combustion and which provides the least?           CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l)                     ΔH° = -890 kJ            2 C2H2(g) + 5 O2(g) → 4 CO2(g) + 2 H2O(l)          ΔH° = -2599 kJ            2 CH3OH(l) + 3 O2(g) → 2 CO2(g) + 4 H2O(l)       ΔH° = -1453 kJ A) C2H2provides the most heat per gram and CH4the least. B) C2H2provides the most heat per gram and CH3OH the least. C) CH4provides the most heat per gram and CH3OH the least. D) CH4 provides the most heat per gram and C2H2 the least.

Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter5: Thermochemistry
Section: Chapter Questions
Problem 5.92QE: What mass of acetylene, C2H2(g), must be burned to produce 3420 kJ of heat, given that its enthalpy...
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  1. Which of CH4(g), C2H2(g), and CH3OH(l) provides the most heat per gram upon combustion and which provides the least?

          CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l)                     ΔH° = -890 kJ

           2 C2H2(g) + 5 O2(g) → 4 CO2(g) + 2 H2O(l)          ΔH° = -2599 kJ

           2 CH3OH(l) + 3 O2(g) → 2 CO2(g) + 4 H2O(l)       ΔH° = -1453 kJ

A) C2H2provides the most heat per gram and CH4the least.

B) C2H2provides the most heat per gram and CH3OH the least.

C) CH4provides the most heat per gram and CH3OH the least.

D) CH4 provides the most heat per gram and C2H2 the least.

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