Gas Law Problem: Finding Pressure of Carbon Monoxide

What is the pressure of the carbon monoxide in the given scenario?

A) 740 torr

B) 756 torr

C) 769 torr

D) 777 torr

Final answer:

The pressure of the carbon monoxide is 740.5 torr.

When a gas is collected over water, the pressure of the gas is equal to the total pressure minus the vapor pressure of water at that temperature. In this scenario, the total pressure is given as 756 torr and the temperature is 18°C.

We need to subtract the vapor pressure of water at 18 °C from the total pressure to find the pressure of the carbon monoxide. According to Table 8.2, the vapor pressure of water at 18 °C is approximately 15.5 torr.

Therefore, the pressure of the carbon monoxide is calculated as follows: 756 torr - 15.5 torr = 740.5 torr.

Therefore, the correct answer is A) 740 torr.