Heat Is Added to a Pure Substance in a Closed

question 17

Multiple Choice

Heat is added to a pure substance in a closed container at a constant rate. The figure shows a graph of the temperature of the substance as a function of time. If Lf = latent heat of fusion and L_v = latent heat of vaporization, what is the value of the ratio L_v / Lf for this substance?

• A) 5.0
• B) 4.5
• C) 7.2
• D) 3.5
• E) 1.5

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