an organic compound contains 49.3 percent carbon,6.84percent hydrogen and its vapour density is 73.molecular formula of compound

Answer 1

Take a 100 g sample. That gives you
49.3 g C
6.84 g H
You need to know what the remainder is. I suspect oxygen, then
43.86 g oxygen.
Convert to moles.
49.3/12 = ??
6.84/1 = ??
43.86/16 = ??
Now find the ratio of the atoms to each other with the smallest whole number being 1. The easy way to do that is to divide the smallest number by itself; then divide the other numbers by the same small number. Then round to whole numbers; however, don't found too much. That is, if close to 1/2, then multiply all of the number by 2 to arrive at whole numbers. Post your work if you get stuck.