Heat Is Added to a Substance at a Constant Rate

question 113

Multiple Choice

Heat is added to a substance at a constant rate. The substance starts as a solid and is melted; the liquid is heated and vaporized; finally, the vapor is heated. This process is shown in the graph. The latent heat of vaporization can be found by

• A) multiplying the length of B in seconds) by the rate at which heat is added, and dividing by the mass of the substance.
• B) multiplying the length of D in seconds) by the rate at which heat is added, and dividing by the mass of the substance.
• C) multiplying the slope of A by the rate at which heat is added, and dividing by the mass of the substance.
• D) multiplying the slope of C by the rate at which heat is added, and dividing by the mass of the substance.
• E) multiplying the slope of E by the rate at which heat is added, and dividing by the mass of the substance.

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