chemistry
posted by hriday .
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.
There is no pressure listed but make up one to use (the easiest is to use 1 atmosphere). n = grams/molar mass. Solve for volume.
Then use PV = nRT again, this time using P = 1/2 what you used in the first case, change T to the new temperature, and solve for n. Convert n to grams and subtract from 6. Post your work if you get stuck. 
I think I worked this problem for you within the last week. Perhaps some other student.