thermochemistry

The molar heat of vaporization has a

• positive value

• negative value

The molar heat of condensation for a substance

• is the amount of heat released when one mole of a vapor condenses at its normal boiling point.

• is the amount of heat absorbed when one mole of a liquid vaporizes at a constant temperature.

the molar heat of solidification has a

• positive value

• negative value

If the temperature of the solution lowers when the solute dissolves, the solution process is

• endothermic

• exothermic

the process that releases the most heat.

• Condensation of 1 mol of water at 100°C

• Vaporization of 1 mol of water at 100°C

• fusion of 1 mol of water

As liquids absorb heat at their boiling points, the temperature remains constant while they vaporize.

• true

• false

the amount of heat released when one mole of vapor condenses at its normal boiling point.

• molar heat of fusion

• molar heat of condensation

• molar heat of solidification

the reason hot vapors such as steam can be very dangerous

• The large values for ΔHcond

• The large values for ΔHsolid

• The large values for ΔHfus

The molar heat of condensation of a substance is the same, in magnitude, as which of the following?

• molar heat of solidification

• molar heat of fusion

• molar heat of vaporization

The amount of heat required to vaporize one mole of a given liquid at a constant temperature is called

• molar heat of fusion

• molar heat of condensation

• molar heat of vaporization