The empirical formula for acetylene is CH, and it's molar mass is 26.04. What is the molecular formula?

Molecular Formula of acetylene = C2H2

Calculations:

Empirical formula = CH

Molar mass = 26.04

Molecular formula = ?

1. Determine the Empirical formula weight.

Empirical formula weight = (1 x 12.01g/mol) + (1 x 1.01g/mol) = 13.02 g/mol

2. Divide the molar mass for the molecular formula by the empirical formula mass. The result determines how many times to multiply the subscripts in the empirical formula to get the molecular formula.

The molar mass of this compound is 26.04g/mol

Number of moles = mass/molar mass

26.04/13.02 = 2

Multiply empirical formula with number of moles to get the molecular formula.

CH x 2 = C2H2

The Molecular formula of acetylene is = C2H2