00:01
Hello, hi students, let me explain you the question.
00:03
Here, how many s -o -2 molecules? how many s -o -2 molecules? they are present in 15 grams of s -o -2.
00:15
So, this is the question.
00:19
So here, first of all, first of all, the moles of s -o -2.
00:26
Moles of s -o -2.
00:28
Here they have given mass of s -o -2, and we know the molar mass of s -o -2.
00:33
Of s -o -2.
00:35
Molar mass of s -4 -2 that is equal to 64 .066.
00:41
So how to find out moles? mass divided by molar mass.
00:46
Mass divided by molar mass.
00:48
The mass, it is 15 grams.
00:51
Molar mass, it is 64 .066 grams per mole.
00:57
So then it is given as, so whenever we calculate this, it will get, we'll get 0 .0 .2341.
01:09
So now molecules of molecules of s -o -2.
01:15
So we know that one mole contain, one mole of any substance contain avogadro number of molecules.
01:26
Avagadro number of molecules...