Question

An oleum sample is labelled as 104.5%. How many number of moles of sulphur atoms are present in 100g of this sample?

Answer 1

Answer:

An oleum sample is labelled as 104.5% . means, 100g of oleum (H2S2O7) require, 4.5g water to form 104.5g sulphuric acid ( H2SO4). so, here we see in one molecule of oleum contains two atoms of Sulphur.