00:01
Hello students, so in this video we are going to find the molecular formula of a compound with the elements ch and n and the molar mass is given as 102 .18 gm per mole.
00:22
So we can do that using this table.
00:25
So firstly, the first is the element.
00:27
The element we have is carbon, hydrogen and nitrogen and then we have the percentage composition.
00:34
So we have 58 .77 for carbon, for hydrogen we have 13 .81 and for nitrogen we have 27 .42.
00:42
Now we will find the mass.
00:45
So mass is actually, the formula is the percentage given, percentage of the molar mass of the compound.
00:56
So, this let me write for the other two as well.
01:07
So these will give the answer as 60 .05 for carbon, 14 .11 for hydrogen and 28 .02 for nitrogen.
01:19
Now that we have the mass, we will find the number of moles.
01:24
So the number of moles is mass by molar mass.
01:26
So that is, here it will be 60 .05 by 12, here it will be 14 .11 by 1, here it will be 28 .02 by 14.
01:38
So the answer is, here it is 5, then here we have 14 .11, let it be 14 only approximately and here we have 7...