Question

determine the empirical and molecular formula of a compound which has the molecular mass of 90grams/mole, which contains 80.0% carbon and 20% hydrogen

Answer 1

Answer :

Empirical formula : CH3

Molecular Formula : C6H18

Step-by-step explanation :

C : H

80/ 12 : 20/ 1

6.67/ 6.67 : 20/ 6.67

1 : 3

Therefore : CH3

Molecular formula :

First calculate n

n = Relative molecular mass / Empirical formula mass

= 90/15

= 6

Therefore : ( CH3) subscript 6

= C6H18