An organic compound on analysis gave C=57.8% and H=3.6% and rest of oxygen.The vapour density of the compound was found to be 83.Find the molecular formula of the compound?

Answer 1

Take a 100 g sample to give you 57.8g C, 3.6g H and 38.6 g O.
Convert to mols.
57.8/12 = ?
3.6/1 = ?
38.6/16 = ?

Now find the ratio of CHO to each other with the lowest being no smaller than 1.00. The easy way to do this is to divide the smaller number by itself, then divide the other numbers by the same small number. In this case, you don't get whole numbers so
multiply all of those resultant numbers by 2, 3, 4, 5, etc until you come out with numbers that can be rounded to whole numbers. You will find that number to be 4.
Post your work you get stuck. I didn't so the molecular formula. There is more than one definition for vapor density and I don't know which you are using.

Answer 2

Just me

Answer 3

One formula that ik of is molecular mass/Empertical formula mass=n
n is the subscript you need for your formula.