Question

Given a gas collected over water at an external pressure of 740 mmHg at 45°C, what would be the pressure of the dry gas?

A) 730 mmHg
B) 740 mmHg
C) 750 mmHg
D) 760 mmHg

Answer 1

The pressure of the dry gas can be determined by subtracting the vapor pressure of water at the given temperature from the measured pressure. In this case, the pressure of the dry gas would be 668.3 mmHg.

Step-by-step explanation:

The pressure of the dry gas can be determined by subtracting the vapor pressure of water at the given temperature from the measured pressure. In this case, the vapor pressure of water at 45°C is 71.7 mmHg. Therefore, the pressure of the dry gas would be 740 mmHg - 71.7 mmHg = 668.3 mmHg.