Question

1.An acid was analysed and found to contain 2.44% hydrogen,39.02% sulphur and 58.54% oxygen.find imperical formular of the Acid?

Answer 1

Sulfurous acid
`H_2 SO_3`

Explanation:

You can use one of the percentages you have listed to find the total molecular mass.
E.g. using sulfur we get

`(M_S)/x = 0.39`

solve for x and you get the total molar mass as:

`M_(t o t a l) = 82.079`

To get how many sulfur, oxygen and hydrogen we do as following:
E.g. for oxygen we get:
`(x*15.99)/(82.079) = 0.58` `x -> 3`

which means that there are three oxygens.
now you can subtract the molecular mass of the `M_(t o t a l)` and see how many hydrogens you will need.