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### Three common hydrocarbons that contain four carbo…

13:11
Oklahoma State University

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Problem 113

Ammonia $\left(\mathrm{NH}_{3}\right)$ boils at $-33^{\circ} \mathrm{C} ;$ at this temperature it has a density of 0.81 $\mathrm{g} / \mathrm{cm}^{3} .$ The enthalpy of formation of $\mathrm{NH}_{3}(g)$ is $-46.2 \mathrm{kJ} / \mathrm{mol},$ and the enthalpy of vaporization of $\mathrm{NH}_{3}(l)$ is 23.2 $\mathrm{kJ} / \mathrm{mol} .$ Calculate the enthalpy change when 1 $\mathrm{L}$ of liquid $\mathrm{NH}_{3}$ is burned in air to give $\mathrm{N}_{2}(g)$ and $\mathrm{H}_{2} \mathrm{O}(g) .$ How does this compare with $\Delta H$ for the complete combustion of 1 Lof liquid methanol, $\mathrm{CH}_{3} \mathrm{OH}(l) ?$ For $\mathrm{CH}_{3} \mathrm{OH}(l),$ the density at $25^{\circ} \mathrm{C}$ is $0.792 \mathrm{g} / \mathrm{cm}^{3},$ and $\Delta \mathrm{H}_{f}^{\circ}=-239 \mathrm{kJ} / \mathrm{mol}$

$-1.59 \times 10^{4} k J / L$

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## Video Transcript

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