00:01
Hello.
00:04
So here we're going to need additional information which is that for the so we're going to give some arbitrary values here.
00:13
So let's say m1 which is the molecular mass or the molecular weight to be 10 ,000 gram per mole for the 400 molecules let's say m2 is 20 ,000 gram per more for the 800 molecules and 3 is 30 ,000 gram per more for 600 molecules.
01:21
So for the first part, we need to calculate for the number average molecular weight.
01:33
So the number average molecular weight, the summation of n -i, n -i over the summation of n -i.
01:50
So this is 400 times 10 ,000.
02:02
We have 800 times 20 ,000.
02:08
We have 600 times 30 ,000.
02:17
By the total number of moles, molecules is 400 plus 800 plus 800 plus 600.
02:34
We're going to have 38 times 10 to the 6 divided by 18...