Write the formulas for saturated monohydric alcohols, the molar masses are 74 g / mol and 116 g / mol.

Given:
M (alcohol1) = 74 g / mol
M (alcohol2) = 116 g / mol

To find:
alcohol1 -?
alcohol2 -?

Solution:
1) Saturated monohydric alcohols have the general formula:
CnH2n + 1OH;
2) M (alcohol1) = Mr (alcohol1) = Ar (C) * N (C) + Ar (H) * N (H) + Ar (O) * N (O) + Ar (H) * N (H );
74 = 12 * n + 1 * (2n + 1) + 16 * 1 + 1 * 1;
n = 4;
3) Alcohol1 – C4H9OH;
4) M (alcohol2) = Mr (alcohol2) = Ar (C) * N (C) + Ar (H) * N (H) + Ar (O) * N (O) + Ar (H) * N (H );
116 = 12 * n + 1 * (2n + 1) + 16 * 1 + 1 * 1;
n = 7;
5) Alcohol2 – C7H15OH.

Answer: Alcohol1 – C4H9OH; alcohol2 – C7H15OH.