Heat Is Added to a Substance at a Constant Rate

question 34

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 at constant volume. This process is shown in the graph. The specific heat at constant volume of the vapor 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) dividing the rate at which heat is added by the product of the slope of A and the mass of the substance.
• D) dividing the rate at which heat is added by the product of the slope of C and the mass of the substance.
• E) dividing the rate at which heat is added by the product of the slope of E and the mass of the substance.

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