Question

Empirical formula of a hydrocarbon containing 80% carbon and 20% hydrogen is:

• A. $CH$
• B. $C{{H}_{2}}$
• C. $C{{H}_{3}}$
• D. $C{{H}_{4}}$

Answer 1

Answer: (C)

$C{{H}_{3}}$

Answer 2

Element % Atomic weight Percentage at weight Simple ratio C 80 12 $\frac{80}{12}=6.67$ $\frac{6.67}{6.67}=1$ H 20 1 $\frac{20}{1}=20.0$ $\frac{20.0}{6.67}=3$ Hence, empirical formula of hydrocarbon $=C{{H}_{3}}$ .