00:01
We're given the following information for number one of this problem.
00:04
We have 10 .0 grams of nitrogen gas.
00:07
We have 12 .0 grams of oxygen gas.
00:11
First, let's convert each of these to moles.
00:24
10 divided by 28 .02 is 0 .3569 moles of n2.
00:37
Next, we'll take our 12 .0 .0.
00:39
Of oxygen divided by 32 .00 grams per mole.
00:50
12 divided by 32 is 0 .375 moles of 0 .2.
01:03
To find the mole fraction first of n2 we will take 0 .3569 divided by the total of 0 .3569 plus 0 .375.
01:27
.3569 divided by sum .3569 plus .375.
01:37
0 .4876.
01:41
Now we could do the same thing for oxygen, or we could just take 1 minus nitrogen.
01:50
So 1 minus 0 .4876, equals 0 .5124.
02:07
Those are my mole fractions for 02 and n2 respectively.
02:20
Okay, oopsie.
02:31
So i know how many moles, i know how the volume is, and i know everything else.
02:37
So i can figure out how many moles i have total.
02:40
And i think since i'm going to do the partial pressures first, i could use mole fractions, but i think i'm just going to use p equals n -r -t over v.
03:03
N was 0 .3569 and do what do i care what my p is in? i guess i'll go with atmospheres and my temperature is 290 .3569 times 0 .0820 times 0 .0820x26 times 290 divided by 25.
04:02
My pressure of this will be 0 .3397 atmospheres.
04:11
I think i should probably report these to three sig figs.
04:28
That is my partial pressure of n2.
04:40
Now my pressure for will be calculated the same way.
04:55
Everything else is exactly the same.
05:55
Okay, so i have 0 .3.
06:00
Let me do this.
06:01
P of n2 p of o2, 0 .357 atmospheres, and 0 .340.
06:27
So my p total will equal to some of these, 0 .697 atmospheres.
06:38
Next, total pressure mixture.
06:45
Combustion of gasoline, which is given right here.
07:12
We have 40 grams of gasoline, and it's reacted with 150, grams of 02 and our actual yield is given as 105 .0 .0.
07:59
We are asked to find the percent yield.
08:07
First i guess we better find the theoretical yield.
08:20
First the theoretical yield.
08:28
Molar mass of gasoline is 114 .23...