00:01
So we want to put these gases in order of increasing average molecular speed.
00:05
So we're going to do that based on their molar masses.
00:10
Lighter gases move faster.
00:13
So co is 28 .01 grams per mole.
00:18
Sf6 is 146 .07.
00:24
H2s is 34 .09.
00:31
Cl2, it's diatomic, so 70 .9, and hbr 80 .91.
00:42
So this is the fastest, because it's the lightest, and sf6 is the heaviest, so it's going to be the slowest.
00:55
So sf6 is slower than hbr, is slower than cl2, is slower than h2s, is slower than co.
01:07
Okay, so now we're going to first.
01:09
The root means speed.
01:12
This is equal to 3 times r times our temperature divided by our molar mass and we need to take the square root of that whole thing.
01:24
So if we do this for co, that's going to be 3 and the r for joules is 8 .314 joules per mole kelvin...