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bmartz
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Homework Statement
At 332 K and 1.28 x 10-2 atm, the density of a gas is 1.89 x 10-5 g/cm3. (a) Find vrms for the gas molecules. (b) Find the molar mass of the gas.
Homework Equations
Vrms=√(3RT/M) (RMS speed)
PV=nRT (Ideal Gas Law)
D=m/V (Density)
M = m/n (Molar mass = mass/number of moles)
The Attempt at a Solution
Am I doing this wrong or is Wiley Plus wrong?
From Ideal Gas Law: V = nRT/P
Sub into Density: D = m/(nRT/P) = mP/nRT = (m/n)(P/RT)
Sub Molar mass: D = MP/RT
So M = DRT/P
Sub into RMS speed: Vrms = √(3RT/(DRT/P)) = √(3P/D)
After converting the pressure to Pa, and the density to kg/cm3, I got:
a) 4.53x105 = 453000
b) 4.04x10-3 = .0000000404
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