Question

a hydrocarbon contains 10.5 g of varbon per gm of hydrogen calculate the emperical formula​

Answer 1

Explanation:

As we know,

PV=nRT=

M

w

RT

or 1=

M

2.8

×0.0821×400

or M=91.95≈92

Let the formula be C

a

H

b

.

So 12a+b=92

b

12a

=10.5(given)

11.5b=92

or b=8

∴ a=7

Therefore, the formula is C

7

H

8

.

molar mass = 12*7+1*8 = 92gm/mole

Answer 2

Answer:

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Explanation:

hydrocarbon contains 10.5 g of carbon per gram of hydrogen. If 1 L of the vapour of the hydrocarbon at 127 ∘C at 1 atm pressure weights 2.8 g, then the molecular formula mass of the hydrocarbon is ________. Let the formula be CaHb. Therefore, the formula is C7H8.