Enthalpy and Phase Changes Answers

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

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 .

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

A chemist wants to calculate the amount of heat that is absorbed by a sample of copper as it is melted. Which constant should she use?

An engineer wants to determine an efficient method for condensing large amounts of steam into liquid water. Which constant should she use?

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

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 .

Which term is used to describe the amount of heat that is required to melt 1 mol of a substance?

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 .

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