A 3.76 g sample of a noble gas is stored in a 2.00 L vessel at 874 torr and 25°C.What is the noble gas? (R= 0.0821 L atm/ mol K)

Question

Quizplus · Accepted Answer

We can use the Ideal Gas Law to determine the number of moles of gas present in the container. PV = nRT, where P = 874 torr, V = 2.00 L, T = 25°C = 298 K, and R = 0.0821 L atm/ mol K. Solving for n, we get n = PV/RT = (874 torr)(2.00 L)/(0.0821 L atm/ mol K)(298 K) = 0.160 mol. The molar mass of the gas can be calculated by dividing the mass of the sample by the number of moles: 3.76 g/ 0.160 mol = 23.5 g/mol. This molar mass corresponds to the molar mass of argon, so the noble gas in the container is argon. Therefore, the best choice is C.

A 376 G Sample of a Noble Gas Is Stored in in a 2.00