Using the thermodynamic information in the ALEKS Data tab, calculate the boiling point of hydrogen cyanide (HCN). Round your answer to the nearest degree. °C
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1 kJ/mol) - (-108.9 kJ/mol) ΔH = -26.2 kJ/mol Show more…
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Madhur L.
Show that hydrogen cyanide (HCN) is a gas at $25^{\circ} \mathrm{C}$ by estimating its normal boiling point from the following data:$$\begin{array}{ccc} & \Delta H_{i}^{\circ}(\mathrm{k} J / \mathrm{mol}) & S^{\circ}[J /(\mathrm{mol} \cdot \mathrm{K})] \\\mathrm{HCN}(\ell) & 108.9 & 113 \\ \hline \mathrm{HCN}(g) & 135.1 & 202 \\\hline\end{array}$$
How much heat is needed to vaporize $39.6 \mathrm{~mL}$ of liquid hydrogen cyanide, $\mathrm{HCN},$ at $25.0^{\circ} \mathrm{C} ?$ The density of the liquid is $0.687 \mathrm{~g} / \mathrm{mL}$. Use standard heats of formation, which are given in Appendix $\mathrm{C}$.
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