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Question

Sketch a heating curve for a substance $\mathrm{X}$ whose melting point is $40^{\circ} \mathrm{C}$ and whose boiling point is $65^{\circ} \mathrm{C}$.

(a) Describe what you will observe as a $60.-\mathrm{g}$ sample of $\mathrm{X}$ is warmed from $0^{\circ} \mathrm{C}$ to $100^{\circ} \mathrm{C}$.

(b) If the heat of fusion of $\mathrm{X}$ is $80 .\mathrm{~J}/\mathrm{g}$, the heat of vaporization is $190 .\mathrm{~J}/\mathrm{g}$, and if $3.5\mathrm{~J}$ are required to warm $1\mathrm{~g}$ of $\mathrm{X}$ each degree, how much energy will be needed to accomplish the change in (a)?

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1 of 8The heating curve of a substance X with a melting point of 40 °C and a boiling point of 65°C has to be drawn.

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