Question

A gaseous hydrocarbon contains 80% of carbon and 20% of hydrogen. 1dm3 of the gas at STP weighs 1.35g.find the molecular formula.​

Answer 1

Answer:

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

1.35/24x1000(at rtp)

= 5.625

Molecular mass = 2x density

11.250

Molecular mass = n x emperical formula

11.250=nx 15

n = 11.250/15=0.8

Approx 1

So molecular formula is CH3

Explanation:

Hope it helps you

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