Question

two elements x (atomic weight=75) and Y (atomic weight =16) combine to give compound having 75.8% of X. The formula of compound is:

Answer 1

Oke so 75.8% X, that means there's 24.2% Y

Let the total weight be 100 gram
then we have 75.8 gram X
and 24.2 gram Y

Now calculate how many moles of X and Y we have
Divide the masses by the given atomic weight of the compounds.

When you're done. you divide both amount of moles by the smallest amount.

So FOR EXAMPLE if you had 7 mol X and 21 mol Y
then you divide 7 by 7 (which is 1) and 21 by 7 (which is 3) So for this example the ratio would be 1:3 and the formula would be \(\large\sf XY_3\)

Now do the same thing for your example

Answer 2

Note that \(\large\sf XY_3\) is NOT the answer, just an example