Question

Which of the following is the most appropriate definition of the normal boiling point of a liquid?

• A. The temperature at which the liquid boils.
• B. The pressure at which the liquid boils at ${100}^{0}C$.
• C. The temperature at which the liquid's vapor pressure is 1 atm.
• D. ${100}^{0}C$.
• E. Dependent upon the pressure above the liquid.

Answer 1

The correct option is C The temperature at which the liquid's vapor pressure is 1 atm.

Normal boiling point of a liquid is defined as the temperature at which the liquid's vapor pressure is equal to the defined atmospheric pressure at sea level, which is $1$ $atm$

Thus, option C is the correct answer.