00:01
Hi, now we will discuss a problem based on how to find a molecular formula of a unknown compound.
00:07
Here some information is given, element and its mass percentage is given, carbon 44 .7, hydrogen, hydrogen, 2, oxygen, 47 .72, from that we have to find a molecule's order.
00:19
But that first we have to find the number of gram atoms of carbon, hydrogen and oxygen.
00:23
Number of gram atoms of carbon hydrogen and oxygen they have to find this can be found from the given mass percentage and divided by molar mass of carbon that is dual so which will give us 3 .731 and for hydrogen given mass percentage is molar mass of carbon that is 1.
01:01
7 .52 and for oxygen even mass percentage is 47 .72 its molar mass is 60 so number of gram atoms of oxygen 2 .980 after this we have to find the atomic ratio you can find the atomic ratio of these two compounds these three elements carbon hydrogen and oxygen by dividing the number of gram atoms of carbon, hydrogen and oxygen by least number.
01:38
Among the given carbon, hydrogen and oxygen, oxygen has the least number of atoms.
01:45
This number of gram atoms of oxygen is there.
01:48
So we have to divide all these values with this number...