Hydrocarbons are compounds of carbon and hydrogen only. Hydrocarbon Z is composed of 80% carbon and 20% hydrogen.

a. Calculate the empirical formula of hydrocarbon Z.
(A_r values: C = 12.0, H = 1.0)

b. The molar mass of hydrocarbon Z is 30.0 g mol^–1. Deduce the molecular formula of this hydrocarbon.

c. When 50 cm³ of hydrocarbon y is burnt, it reacts with exactly 300 cm³ of oxygen to form 200 cm³ of carbon dioxide. Water is also formed in the reaction. Deduce the equation for this reaction. Explain your reasoning.

d. Propane has the molecular formula C₃H₈. Calculate the mass of 600 cm³ of propane at r.t.p. (1 mol of gas occupies 24 dm³ at r.t.p.) (A_r values: C = 12.0, H = 1.0)