W is a compound made up of carbon, hydrogen and oxygen.
(a)[3]
By mass, W is 57.1% carbon and 4.8% hydrogen. Calculate the empirical formula of W.
(b)[3]
A sample of W with a mass of 0.194 g reacts fully with 18.5 cm$^3$ of 0.250 mol/dm$^3$ KOH. One mole of W reacts with three moles of KOH. Calculate the relative formula mass of W.
(c)[1]
Deduce W's molecular formula.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Calculate the oxygen percentage” …