Gas Question

[HopefulOncoDoc]

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What is observed over time if a mixture of H2 and D2, initially at 50% by moles H2, undergoes effusion?

A. P H2 decreases; X D2 decreases.
B. P H2 increases; X D2 decreases.
C. P H2 decreases; X D2 increases.
D. P H2 increases; X D2 increases.

The answer is C. Could someone please help me out with this problem? Thanks.

 

[Phosphorus Ylide]

Graham's law. Hydrogen is 1 and deuterium is 2. rate 1/rate 2= sqrt(mol.wt 2/mol. wt 1) Since deuterium is heavier than hydrogen, sqrt of that is a number greater than 1 and therefore rate 1/rate 2 is also greater than 1. This means that hydrogen will diffuse faster than deuterium and over time, there will be more D2 than H2.

 

[ChemEngSoonMD]

I got a question about gas. If I drink 54 grams of protein shake, and only 40 grams get digested. How many moles of methane will I expel?