Question

1 mole of hydrocarbon on complete combustion form 4 mole CO2(g) and 4 mole of water. The total number of atoms in hydrocarbon is​

Answer 1

Answer:

The combustion reaction can be represented as C

x

H

y

+(x+

4

y

)O

2

→xCO

2

+

2

y

H

2

O.

At STP, 1 mole of any gas occupies 22.4L

10 ml of hydrocarbon, 50 ml of water and 40 ml of carbon dioxide corresponds to 0.45, 2.23 and 1.79 moles respectively.

Hence, the combustion of 1 mole of hydrocarbon will produce 5 moles of water and 4 moles of carbon dioxide.

Thus, the molecular formula contains 4 carbon atoms and 10 hydrogen atoms.

The hydrocarbon is C

4

H

10

and the combustion reaction is C

4

H

10

+6.5O

2

→4CO

2

+5H

2

O.

Answer 2

Given: 1 mole of hydrocarbon on complete combustion form 4 mole CO2(g) and 4 moles of water.

To find: We have to find the number of atoms.

Solution:

The chemical formula of carbon dioxide is $CO_2$.

The chemical formula of water is $H_2O$.

A hydrocarbon is made with carbon, hydrogen and oxygen.

1 mole of hydrocarbon on complete combustion from 4-mole carbon dioxide and 4 moles of water.

So, $4CO_2$ and $4H_2O$ will present in the hydrocarbon.

So, the formula of the hydrocarbon is $C_4H_8O_12$.

Several atoms will ve 4+8+12=24.

The total number of atoms in hydrocarbon is 24.