A compound has an empirical formula of CH2 and molecular mass of 84g. What is it's molecular formula?

mass of CH2=14

84/14=6

molecular formula= C6H12

mama

(CH2) * n=84

(12+2*1)*n= 84
14*n=84
n= 84/14
n=6

(CH2)*6 = C6H12

To determine the molecular formula of a compound given its empirical formula and molecular mass, you need to know the molar mass of the empirical formula. In this case, the empirical formula is CH2, which has a molar mass of 14 g/mol (C: 12 g/mol + 2H: 1 g/mol).

To find the molecular formula, you divide the molecular mass of the compound by the molar mass of the empirical formula to calculate the number of empirical formula units present in each molecule:

Molecular formula units = Molecular mass / Empirical formula molar mass

In this case, the molecular mass is given as 84 g/mol, and the molar mass of the empirical formula CH2 is 14 g/mol. Plugging these values into the formula:

Molecular formula units = 84 g/mol / 14 g/mol = 6

This indicates that in every molecule of the compound, there are six empirical formula units.

To determine the molecular formula, you multiply the subscripts of the empirical formula by this factor:

(CH2) x 6 = C6H12

Therefore, the molecular formula of the compound is C6H12.