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3.
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Methane, CH4(g), is the main component of natural gas. When the barrel of a Bunsen burner is wide open, more oxygen (O2(g)) is available for the combustion of the methane. The products are entirely CO2(g) and H2O(g). When the barrel is nearly closed, the products are CO2(g) and some H2O(l).
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(a) Calculate ΔG° at 25°C for each reaction.
(b) Calculate K for each reaction.
(c) Which burner adjustment gives a hotter flame?
(d) Why does opening the barrel on the burner force a more complete combustion?
4.
Use the reference values for ΔH°f and S° from Table A8 in the appendix to calculate ΔH°, ΔS°, and ΔG° for the reaction: CO(g) + H2O(g) CO2(g) + H2(g) at 25°C. (a) ΔH° (Show all work completely.)
(b) ΔS° (Show all work completely.)
(c) ΔG° (Use the Gibbs-Helmholtz equation with a temperature of 25°C.)
212 Chapter 3 Thermodynamics
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