Enthalpy and Phase Changes Answers

This table has information about the heat of fusion and the heat of vaporization of different substances.Which substance absorbs 58.16 kJ of energy when 3.11 mol vaporizes?Use .

What scientific tool would be the most helpful when measuring the temperature of a substance that is undergoing a phase change?

NaCl has a Hfus = 30.2 kJ/mol. What is the mass of a sample of NaCl that needs 732.6 kJ of heat to melt completely?Use .

A sample of substance X that has a mass of 326.0 g releases 4325.8 cal when it freezes at its freezing point. If substance X has a molar mass of 58.45 g/mol, what is the molar heat of fusion for substance X?Use .

Which energy changes are associated with a liquid boiling?

Which scientific tool is the most useful when trying to convert a known amount of grams of water to moles of water?

Copper has a Hfus = 13.0 kJ/mol. What mass of copper releases 112.4 kJ of heat as it freezes?Use .

Consider the graph below.Which phase change is most likely taking place in this graph?

During an endothermic phase change, what happens to the potential energy and the kinetic energy?

The graph below illustrates a change in energy during a phase change.Which explanation correctly describes the phase change in the graph?