Help needed! Please help answer all questions posted! Much would be appreciated!

Question

Help needed! Please help answer all questions posted! Much would be appreciated!! Thank you!

1) The heat of vaporization of a substance is the change in ______ at a certain temperature and pressure when transitioning between liquid and vapor.

(Choose the best choice):

-Specific enthalpy

-Enthalpy

-Internal Energy

-Heat

2)The heat of vaporization of a substance is the change in specific enthalpy at 1 atm and the normal boiling point when transitioning between:

(Choose the best choice):

-Vapor and liquid

-Solid and Liquid

-Vapor and solid

3)The enthalpy change as a result of phase change depends significantly on pressure.

True or False

Explanation / Answer

1. enthalpy chnage

concept: total heat for that process

2. -Vapour and liquid

Concept: vaporization happens from liquid to vapor state

3. True

As the pressure changes, enthalpy changes as enthalpy is pressure-dependent.

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