Question

What is the molar mass of a gas that has a mass of 0.261 g in a 0.134 l vessel at 397 k, 0.992 atm? view available hint(s) what is the molar mass of a gas that has a mass of 0.261 g in a 0.134 l vessel at 397 k, 0.992 atm? 1.15 g/mol 9.49 × 103g/mol 64.0 g/mol 171 g/mol?

Answer 1

Answer: -

64.0 g/mol

Explanation: -

Volume V = 0.134 L

Pressure P = 0.992 atm

Temperature T = 397 K

Using the combined gas equation

PV = nRT

Number of moles n =
`(PV)/(RT)`

=
`(0.992 atm x 0.134 L)/(0.082 L atm K−1 mol−1 x 397 K)`

= 0.0041

Mass = 0.261 g

Molar mass = Mass / Number of moles

=
`(0.261 g)/(0.0041 mol)`

= 64.0 g / mol