chemical quantities

Question

A compound contains C, H, and F in a 1:2:2 ratio.  

Determine the empirical formula. 

If the actual molar mass is 208 g/mol, what is the molecular formula?

Answer 1

Empirical formula = CH₂F₂

molar mass of CH₂F₂ = 12 + 2 + 38 = 52 g/mol

208 / 52 = 4

Molecular formula = 4 x CH₂F₂ = C₄H₈F₈