Determination of the molecular formula of alcohols

Exercise 1

Given a molar mass of a saturated aliphatic mono-alcohol: $74\;\frac{g}{mol} $ Determine its molecular formula!

General formula: $C_nH_{2n+2}O$ $M$ $=$ $74$ $12n$ $ +$ $2n$ $+$ $2$ $+$ $16$ $=$ $74$ $n$ $=$ $4$ Molecular formula: $C_4H_{10}O$