If a cylinder contains 2 mol of He and 6 mol of Ne at 298 K and 800 torr, what is the partial pressure of Ne?

To find the partial pressure of Ne in the cylinder, you can apply Dalton's Law of Partial Pressures, which states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of each individual gas in the mixture.

First, calculate the total number of moles of gas in the cylinder. In this case, you have 2 moles of He and 6 moles of Ne, giving you a total of 8 moles of gas.

Next, you can determine the mole fraction of Ne, which is the ratio of the number of moles of Ne to the total number of moles. The mole fraction of Ne can be calculated as follows:

Mole fraction of Ne = Moles of Ne / Total moles = 6 mol / 8 mol = 0.75.

The partial pressure of an individual gas can be calculated by multiplying the total pressure by the mole fraction of that gas. The total pressure provided is 800 torr. Therefore, the partial pressure of Ne is calculated as:

Partial pressure of Ne = Total pressure × Mole fraction of Ne = 800 torr × 0.75 = 600 torr.

This calculation shows that the partial pressure of Ne is indeed 600