Question

empirical formula of a compound CH2. One mole of this compound has a 42 gm. it's molecular formula is

Answer 1

`C_3H_6`

Explanations:

The formula for calculating the molecular formula given empircal formuls is expressed as;

`molecular\text{ formula}=(empirical\text{ formula})_n`

Substitute the given parameter to have:

`\begin{gathered} 42=(CH_2)n \\ 42=(12+2(1))n \\ 14n=42 \\ n=(42)/(14) \\ n=3 \end{gathered}`

Determine the molecular formula

`\begin{gathered} molecular\text{ }formula=(CH_2)_3 \\ molecular\text{ }formula=C_3H_6 \end{gathered}`

Hence the molecular formula of the given compound is C3H6