The mass fractions of hydrogen, sulfur and oxygen in some acid are, respectively, 2.04%

The mass fractions of hydrogen, sulfur and oxygen in some acid are, respectively, 2.04% 32.65% 65.31%, establish the simplest formula of this acid.

To find out the true formula of the acid, you need to designate all the constituent components through the unknown:
Hx: Sy: Oz.
Let’s write down the molar masses of these substances:
Mr (H) = 1.0079 g / mol.
Mr (S) = 32.0655 g / mol.
Mr (O) = 15.9994 g / mol.
Knowing the mass fractions, we write down the ratio:
x: y: z = 2.04 / 1: 32.65 / 32: 65.31 / 16 = 2: 1: 4.
We get the formula for sulfuric acid H2SO4.