Question

What is the percentage composition of elements, carbon and hydrogen, in the hydrocarbon molecules listed below?
note=Ar(C)=12, Ar(H)=1
(a) methane CH4;
(b) ethane C2H6;
(c) propane C3H8;
(d) butane C4H10.

Answer 1

Answer:

(c) propane C3H8;

X = Ar(C) / Mr(CH4) * 100% = 12 / 16 * 100% = 75%