Question

a vessel has 6 g oxygen at a pressure P & temp 400 K . a small hole is made in it so that oxygen leaks out . how much oxygen leaks out if the pressure is P/2 & temperature 300 K ?

1. 5g
2. 4g
3. 2g
4. 3g

Use PV = nRT. To make things easier, I would assign P = 1 for initial P and 0.5 for the second run. Calculate V.
Then use PV = nRT with new conditions but solve for n and convert to grams. Subtract from the 6 g initially. Post your work if you get stuck.
Dr Bob222 can u post the answer ?

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