At standard atmospheric pressure ($1 \mathrm{atm}$), what is the normal boiling point of water in kelvin?

• A. $212 K$
• B. $273.15 K$
• C. $373.15 K$
• D. $100 K$

Answer: (C)

Verified step by step guidance

1. Understand that the normal boiling point of a substance is the temperature at which its vapor pressure equals the external pressure, which is 1 atm at standard atmospheric pressure.
2. Recall that the boiling point of water at 1 atm is commonly known as 100 degrees Celsius.
3. Convert the boiling point from Celsius to Kelvin using the formula: \(T(K) = T(^\circ C) + 273.15\).
4. Apply the conversion to 100 degrees Celsius: \(T(K) = 100 + 273.15\).
5. Recognize that the resulting temperature in Kelvin is the normal boiling point of water at 1 atm.