# Chemistry

posted by Anonymous

A container at room temperature is filled with equal moles of O2(g), NO2(g) and He(g). The gases slowly leak through a pinhole in the container. After some gas has effused, which relationship is true about the partial pressures of the gas remaining in the container?

a) P He < P O2 < P NO2
b) P NO2 < P O2 < P He
c) P O2 < P NO2 < P He
d) P O2 = P NO2 = P He

I would assume since they have the same molar values they would technically have the same pressure assuming they are in the same container. However, I am not 100% sure.

1. DrBob222

But does each gas effuse at the same rate?

2. Anonymous

I am not sure.

3. DrBob222

They don't. Look up Graham's Law. The rate of effusion is inverse;u proportional to the square root of the molar mass.

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