Question

What is the molar mass of a gas that fills a 1.20l container at a temperature of 305k. the gas has a mass of 1.98g and the container is at a pressure of 0.960 atm.

Answer 1

The molar mass of the gas should be 43.0 g/mol.

Step-by-step explanation:

1.Use the ideal gas law(
`PV=nRT`) & the formula for moles and molar mass(
`n=m/M`).

2.Insert the equation
`n=m/M` into
`PV=nRT` and re-arrange to solve for M(molar mass).
`M = mRT/PV`

3.Insert values and use the gas constant R =
`0.082 (L * atm)/(K * mol)` since the volume is in liters and the pressure is in atmosphere units.

`M = mRT/PV = ((1.98g)(0.082 L*atm/(K*mol))(305 K))/((0.960 atm)(1.20 L))`

4. Your answer should be 42.99 g/mol or 43.0 g/mol.

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