Question

20ml of a mixture of CH4 and C2H4 were burnt in excess of air.The volume Of CO2 produced after explosion and cooling was 30ml.The composition of CH4 from the mixture is
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Answer 1

Answer:

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Explanation:

The contraction on cooling is due to the condensation of water vapour. Thus 17 ml of water are formed in the reaction.

The contraction in the volume of 14 ml is due to the dissolution of carbon dioxide gas. Hence, 14 g of carbon dioxide is present in the mixture after the explosion.

4.5ml

CH

4

→

4.5ml

CO

2

+

9ml

2H

2

O

4ml

C

2

H

4

→

8

2CO

2

+

8ml

2H

2

O

Hence, the composition of the mixture is 4.5 ml methane and 1.5 ml of carbon dioxide.

Answer 2

Explanation:

The reaction is CH

4

+2O

2

→CO

2

+2H

2

O.

At room temperature, water will condense to form liquid water.

1 mole of methane reacts with 2 moles of oxygen to form 1 mole of oxygen.

10 ml (0.445 moles) of methane will react with 20 ml (0.89 moles) of oxygen to form 10 ml (0.445 moles) of carbon dioxide.

Hence, the resulting mixture will contain 10 ml of unreacted methane and 10 ml of carbon dioxide.

The total volume of the mixture will be 20 ml