00:01
So to solve for this, we are going to calculate first the mass of carbon and hydrogen based on the amount produced of carbon dioxide and water.
00:13
So let's start with the mass of carbon.
00:17
So we have 2 .265 grams of co2 produced.
00:24
Produced and for for this to be converted to mass of carbon let's divide this by the molar mass of co2 which is 44 .01 grams for every mole of co2 and then for every one mole of co2 we only have one mole of carbon also so how do we convert this to mass we're going to multiply the atomic mass of carbon of carbon this is 12 .01 grams per mole of carbon okay so please refer to your predictable so that you could check the atomic masses of each element so as you can see we could cancel grams all co2 more carbon and our mass of carbon is therefore 0 .61 1g .61 grams and then for hydrogen so we have 1 .2 .36 grams of 1 .6 grams of 1 .6 grams of water h2o and convert this to moles.
01:30
The molar mass of water is 18 .02 grams per every mole of water.
01:36
And then for every one mole of h2o, we have how many hydrogen.
01:42
We have two moles of hydrogen.
01:45
And convert this to mass by multiplying the atomic mass of hydrogen, 1 .01 grams per mole of hydrogen.
01:55
Okay, so cancel the units and we have 0 .386, 0 .1386 grams of hydrogen.
02:11
That's right here carbon.
02:13
And then for the mass of oxygen, so since we know that the mass of our unknown compound is 1 .025 grams, 1 .025 grams.
02:26
If we subtract the mass of carbon and hydrogen, we will get the mass of oxygen.
02:32
So subtract 0 .6181, this is grams, and then 0 .1386, which is also in grams.
02:41
So that means the mass of oxygen is 0 .2683 grams.
02:48
So now we could solve for the number of moles of each element...