Question

a hydrocarbon contains 80% carbon and 20% hydrogen . 1dm3 of the compound at rtp weighs 1.35 g .find the molecular formula

Answer 1

Answer:

Explanation:

C=80%

Mole=80/12=20/3

H=20%

Mole=20/1=20

Mole ratio=1:3

So, emperical formula=CH3

Density=mass/bol

1.35/24×1000(at rtp)

= 5.625

Molecular mass = 2× density

11.250

Molecular mass = n × emperical formula

11.250=n× 15

n = 11.250/15=0.8

Approx 1

So molecular formula is CH3

Thank u