Question

find the molecular formula of an organic compound containing c, h and oxygen in the mass ratio of 3:1:4​

Answer 1

Answer:

An organic compound contains C,H and O. If C (%) : H(%) = 6:1, 700 g of the total mass of C and H (in the compound) will contain 600 g C and 100 g H.

The number of moles of C are

12

600

=50

The number of moles of H are

1

100

=100

Thus the ratio of the number of moles C:H is 50:100 or 1:2.

The molecular formula of the compound is C

x

H

2x

O

y

The balanced chemical equation for the combustion reaction is

C

x

H

2x

O

y

+(1.5x−0.5y)O

2

→xCO

2

+xH

2

O

2y=2(1.5x−0.5y)

y=1.5x−0.5y

x=y

Hence, the molecular formula is C

x

H

2x

O

x

or CH

2

O

Answer 2

Answer:

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