1) If the average velocity of Helium (molecular weight=4g/mole) is 0.707miles/second at room temperature, what will be the average velocity of oxygen(molecular weight 32g/mole) at the same temperature?
2)A gas of unknown composition diffuses at the rate of 10ml/sec in a diffusion apparatus in CH4 (molecular weight=16g/mole) gas diffuses at the rate of 30ml/sec.Calculate the molecular weight of the unknown gas.
please help me answer as much as possible. I have a final on monday =( thanks in advance!
2007-12-14 05:29:08 · 2 answers · asked by Heart You 3 in Science & Mathematics ➔ Chemistry
Do you have a chemistry book? The formulas for the problems should be in there. You should look in your book.
2007-12-14 05:31:48 · answer #1 · answered by kevin h 5 · 0⤊ 0⤋
Since 1/2mv^2 = 1/2kT in each spatial axis, if you hold T constant and increase m by a factor of 8 (32/4), then v must decrease such that:
8*Dv^2 = 1 ---> Dv = sqrt(1/8) = 0.354
Dv is the multiplier for teh speed of teh Helium atoms. So the oxygen atoms atoms is:
v0 = vhe*0.354 = 0.23 miles/second
2007-12-14 05:40:44 · answer #2 · answered by nyphdinmd 7 · 0⤊ 0⤋