Question

Answer to AP chem question

Answer 1

The molecular formula of the compound :
`C_4H_(10)N_2`

Step-by-step explanation:

The empirical formula of the compound :
`C_(2)H_(5)N_(1)`

To calculate the molecular formula of the compound we will first determine the valency.

The equation used to calculate the valency is :

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

We are given:

Mass of molecular formula = 86.16 g/mol

Mass of empirical formula =
`12 g/mol* 2+1 g/mol* 5+14 g/mol= 43 g/mol`

Putting values in above equation, we get:

`n=(86.16 g/mol)/(43 g/mol)=2`

The molecular formula of the compound :

`C_(2n)H_(5n)N_(1n)=C_(2* 2)H_(5* 2)N_(1* 2)`

=
`C_4H_(10)N_2`