Question

What is the vapor pressure of water at ${100}^{\circ }\mathrm{C}?$ How do you know?

Short answer

The vapor pressure of water at ${100}^{\circ }\mathrm{C}$ is 760 Torr or 101.3 kPa. We know this because water boils at 100°C, and at this temperature, its vapor pressure equals the atmospheric pressure, which is the given value.

Step-by-step solution

Find the vapor pressure of water at the given temperature from the table.

Refer to the vapor pressure temperature table for water. Look for the value corresponding to 100°C.

Verify using the boiling point of water.

We know that water boils at 100°C (at sea level), which is when its vapor pressure equals the atmospheric pressure. The standard atmospheric pressure is 760 Torr or 101.3 kPa.

State the vapor pressure of water at 100°C.

The vapor pressure of water at 100°C is equal to the atmospheric pressure, which is 760 Torr or 101.3 kPa.