A 12.3 vessel was found to contain N2, Ar He, and He. The total pressure in the vessel was 987 torr and the partial pressures of nitrogen, argon, and helium were 44 torr, 486 torr, and 218 torr, respectively. What was the pressure of neon in the vessel?
To find the pressure of neon (Ne) in the vessel, we need to use the given information about the pressures of other gases and the total pressure in the vessel.
First, let's calculate the total pressure of the gases other than neon. We know that the partial pressures of nitrogen (N2), argon (Ar), and helium (He) are 44 torr, 486 torr, and 218 torr, respectively. To find the total pressure of these gases, we add their partial pressures:
Total pressure of other gases = Partial pressure of N2 + Partial pressure of Ar + Partial pressure of He
Total pressure of other gases = 44 torr + 486 torr + 218 torr
Total pressure of other gases = 748 torr
Now that we know the total pressure of the other gases, we can calculate the pressure of neon. The total pressure in the vessel is given as 987 torr, which includes the pressure of neon and the pressure of the other gases.
Pressure of neon (Ne) = Total pressure in vessel - Total pressure of other gases
Pressure of neon (Ne) = 987 torr - 748 torr
Pressure of neon (Ne) = 239 torr
Therefore, the pressure of neon in the vessel is 239 torr.