Question

question 7
what is boiling point?
the temperature of a burner on which a substance is heated until it begins to boil
the amount of time it takes a liquid to boil
the temperature at which the vapor pressure of a liquid is equal to the atmospheric pressure
the temperature at which a substance evaporates at a rate of 1 mol/sec

Explanation:

The boiling point is defined as the temperature at which the vapor pressure of a liquid equals the atmospheric pressure. This is the key concept in thermodynamics related to phase - change of liquids to gases. The other options are incorrect as they do not accurately describe the boiling point. The temperature of the burner is not the boiling point, the time to boil is a different property related to heat transfer and quantity of liquid, and evaporation rate of 1 mol/sec is not the definition of boiling point.

Answer:

the temperature at which the vapor pressure of a liquid is equal to the atmospheric pressure