Question

Severus Snape explains that if you have the molar mass of a compound and the empirical formula of a compound you can determine the molecular formula of a compound. Suppose you have a compound which has an empirical formula of C2H3O and molar mass of 86 g/mol. What is the compounds molecular formula

Answer 1

The molecular formula of the compound :
`C_4H_6O_2`

Step-by-step explanation:

The empirical formula of the compound =
`C_2H_3O`

The molecular formula of the compound =
`C_(2n)H_(3n)O_n`

The equation used to calculate the valency is :

`n=\frac{\text{molecular mass}}{\text{empirical mass}}`

We are given:

Mass of molecular formula = 86 g/mol

Mass of empirical formula = 43 g/mol

Putting values in above equation, we get:

`n=(86g/mol)/(43g/mol)=2`

The molecular formula of the compound :

`C_(2* 2)H_(3* 2)O_2=C_4H_6O_2`