### The methane molecule, $\mathrm{CH}_{4},$ has the …

12:19
Oklahoma State University
Problem 125

A sample of a hydrocarbon is combusted completely in $\mathrm{O}_{2}(g)$ to produce $21.83 \mathrm{g} \mathrm{CO}_{2}(g), 4.47 \mathrm{g} \mathrm{H}_{2} \mathrm{O}(g),$ and 311 $\mathrm{kJ}$ of heat. (a) What is the mass of the hydrocarbon sample that was combusted? (b) What is the empirical formula of the hydrocarbon? (c) Calculate the value of $\Delta H_{f}^{\circ}$ per empirical-formula unit of the hydrocarbon. (d) Do you think that the hydrocarbon is one of those listed in Appendix C? Explain your answer.

(a) 6.455$g$
(b) see solution
(c) $$-112.8 \mathrm{K} \mathrm{J} / \mathrm{CH}$$
(d)see for solution

Chapter 5
Thermochemistry
Chemistry the Central Science

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## Video Transcript

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