00:03
So in this question, we're asked using tabular data to find the average molecular mass of air.
00:12
And the really mean thing about this problem is they made you go and find the table again.
00:17
So you had to go back all the way to page 309 to go to table 9 .1 and get this data.
00:24
But they listed the percentages for, i think, eight different gases in that table.
00:30
But they were in descending order.
00:32
And i'm going to stop at carbon dioxide because honestly even the carbon dioxide is probably not going to be in large enough proportion to affect the answer.
00:44
Once we get past that, we're talking on the order of a thousandth of a percent.
00:51
So that's not really going to change our answer after we round it.
00:55
So i'm going to do the first four for good measure, but again, probably even the first two would give you a very very.
01:02
Very good approximation.
01:05
So i'm going to start with the nitrogen.
01:10
So we've got 78 .08 % nitrogen.
01:13
Essentially what we're doing here is we're making a weighted average.
01:16
78 .08 % nitrogen...