Consider the Following Compounds and Their Standard Free Energies of Formation

question 68

Multiple Choice

Consider the following compounds and their standard free energies of formation: $\begin{array}{|c|c|c|c|c|}\hline 1&2&3&4&5\\\hline \begin{array}{c}\mathrm{C}_{6} \mathrm{H}_{12}(\mathrm{l}) \\\text { cyclohexane }\end{array} & \begin{array}{c}\mathrm{CH}_{3} \mathrm{OH}(\mathrm{l}) \\\text { methanol }\end{array} & \begin{array}{c}\mathrm{N}_{2} \mathrm{H}_{4}(\mathrm{l}) \\\text { hydrazine }\end{array} & \begin{array}{c}\mathrm{H}_{2} \mathrm{O}_{2}(\mathrm{l}) \\\text { hydrogen peroxide }\end{array} & \begin{array}{c}\mathrm{CS}_{2}(\mathrm{l}) \\\text { carbon disulfide }\end{array} \\\hline+6.4 \mathrm{~kJ} \cdot \mathrm{mol}^{-1} & -166 \mathrm{~kJ} \cdot \mathrm{mol}^{-1} & +149 \mathrm{~kJ} \cdot \mathrm{mol}^{-1} & -120 \mathrm{~kJ} \cdot \mathrm{mol}^{-1} & +65.3 \mathrm{~kJ} \cdot \mathrm{mol}^{-1} \\\hline\end{array}$ Which of these liquids is (are) Thermodynamically unstable?

• A) 2
• B) 1, 3, and 5
• C) 1 and 4
• D) 2 and 3
• E) 2 and 4

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