Question
The following data have been collected for substance X. Construct a heating curve for substance X. (The drawing does not need to be absolutely to scale, but it should clearly show relative differences.)normal melting point molar heat of fusionnormal boiling pointmolar heat of vaporization$-15^{\circ} \mathrm{C}$$2.5 \mathrm{kJ} / \mathrm{mol}$$134^{\circ} \mathrm{C}$$55.3 \mathrm{kJ} / \mathrm{mol}$
Step 1
These are the temperatures at which the substance changes state, i.e., the melting point and the boiling point. For substance X, the melting point is $-15^{\circ} \mathrm{C}$ and the boiling point is $134^{\circ} \mathrm{C}$. Show more…
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Key Concepts
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The following data have been collected for substance $\mathrm{X}$ . Construct a heating curve for substance $\mathrm{X}$ . (The drawing does not need to be absolutely to scale, but it should clearly show relative differences.) $$ \begin{array}{|l|l|l|}\hline \text { normal melting point } & {-15^{\circ} \mathrm{C}} \\ \hline \text { molar heat of fusion } & {2.5 \mathrm{kJ} / \mathrm{mol}} \\ \hline \text { normal boiling point } & {134^{\circ} \mathrm{C}} \\ \hline \text { molar heat of vaporization } & {55.3 \mathrm{kJ} / \mathrm{mol}} \\ \hline\end{array} $$
Liquids and Solids
Intermolecular Forces and Phase Changes
The following data have been collected for substance X. Construct a heating curve for substance X. (The drawing does not need to be absolutely to scale, but it should clearly show relative differences.) $$ \begin{array}{ll}{\text { normal melting point }} & {-15^{\circ} \mathrm{C}} \\ {\text { molar heat of fusion }} & {2.5 \mathrm{kJ} / \mathrm{mol}} \\ {\text { normal boiling point }} & {134^{\circ} \mathrm{C}} \\ {\text { molar heat of vaporization }} & {55.3 \mathrm{kJ} / \mathrm{mol}}\end{array} $$
Energy Requirements for the Changes of State
A substance, X, has the following properties: Specific Heat Capacities: Hvap = 20. kJ/mol C(s) = 3.0 J/g°C Hfus = 5.0 kJ/mol C(l) = 2.5 J/g°C bp = 75°C C(g) = 1.0 J/g°C mp = -15°C Calculate the energy that must be removed to convert 250 grams of substance X from a gas at 117°C to a solid -41.9°C. Assume X has a molar mass of 75.0 g/mol. Draw out the heating curve.
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