00:01
So for this question we have this substance containing c, h and s.
00:07
And we know that we have 290 .4 milligrams of co2 and the mr of co2.
00:19
So therefore the number of moles of co2 are 290 .4 divided by 1 ,000 to get into grams, multiplied, so divided by 44 is n equals m over mr, which gives us 0 .0 .0066 moles.
00:46
And then we have 39 .60 milligrams of h2o.
00:52
Mr of h2o is 18.
00:56
So the number of moles of h2o is equal to 39 .6 divided by a 3 .9 .6 divided by a 3.
01:06
Divided by 18, which is 0 .022 moles.
01:16
Now from these, we know that every one mole of co2, there's one mole of carbon, so therefore the number of moles of carbon is just also 0 .066.
01:31
For every mole of h2o, there's two moles of hydrogen.
01:36
So we're going to have, sorry, number of moles of hydrogen.
01:46
Number of miles of hydrogen is going to be 0 .001 .1 moles.
01:54
Sorry, not 0 .0 .01.
01:56
It's going to be double that.
01:57
It's going to be 0 .0 .04 moles of hydrogen.
02:06
Obviously, we have double the amount of moles that we have here...