what would be the partial pressure of N2 gas over water at 22*C and 721 torr pressure

To find the partial pressure of N2 gas over water, we can use the concept of vapor pressure. At a given temperature and pressure, water molecules evaporate, creating a partial pressure known as the vapor pressure.

To calculate the partial pressure of N2 gas over water, we need to determine the difference between the total pressure and the vapor pressure of water at the given temperature.

1. Find the vapor pressure of water at 22°C:
The vapor pressure of water increases with temperature. We can use a reference table or an empirical equation to find the vapor pressure. At 22°C, the vapor pressure of water is approximately 21 torr.

2. Determine the partial pressure of N2 gas:
To find the partial pressure of N2 gas, subtract the vapor pressure of water from the total pressure. In this case, subtract 21 torr from 721 torr:
Partial pressure of N2 gas = 721 torr - 21 torr = 700 torr.

Therefore, the partial pressure of N2 gas over water at 22°C and 721 torr pressure is approximately 700 torr.