Question

What is the molecular formula for a compound with an empirical formula of C₅H₄ and a molar mass of 128.16g?

Answer 1

`C_(10) H_(8)`

Step-by-step explanation:

Molecular formula can be calculated by finding the ratio of the molecular molar mass to the empirical molar mass, then multiplying the subscripts of the empirical molar mass by that ratio.

The empirical molar mass is 5(12.01) + 4(1.01) = 64.09g

The molecular molar mass is 128.16g

128.16/64.09 = 2

So the molecular formula is
`C_(10) H_(8)`