Problem: Which of the following statements is(are) true?(a) The enthalpy of vaporization is usually larger than the enthalpy of fusion because it takes less energy per mole to separate particles to form a gas than it takes to melt the same substance.(b) When a substance undergoes a phase change, the temperature remains constant and the added energy is simply lost to the surroundings.(c) As energy is added to a substance at the melting point, the substance is in equilibrium between its solid and liquid phases.(d) Statements (a), (b), and (c) are all false.(e) Only statements (b) and (c) are true.

FREE Expert Solution

We are asked which of the following statements is(are) true regarding phase change. 


Analyze each statement: 

(a) The enthalpy of vaporization is usually larger than the enthalpy of fusion because it takes less energy per mole to separate particles to form a gas than it takes to melt the same substance.

  • This statement is FALSE since if we look at a table of standard values, enthalpy of vaporization and fusion, enthalpy of vaporization is almost always higher. 


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Problem Details

Which of the following statements is(are) true?

(a) The enthalpy of vaporization is usually larger than the enthalpy of fusion because it takes less energy per mole to separate particles to form a gas than it takes to melt the same substance.

(b) When a substance undergoes a phase change, the temperature remains constant and the added energy is simply lost to the surroundings.

(c) As energy is added to a substance at the melting point, the substance is in equilibrium between its solid and liquid phases.

(d) Statements (a), (b), and (c) are all false.

(e) Only statements (b) and (c) are true.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Heating and Cooling Curves concept. You can view video lessons to learn Heating and Cooling Curves. Or if you need more Heating and Cooling Curves practice, you can also practice Heating and Cooling Curves practice problems.