﻿ 0.92 g of an organic compound containing carbon, hydrogen and oxygen was analysed by combustion method. The increase in mass of the U-tube and the potash bulbs at the end of the operation was found to be 1.08 g and 1.76 g, respectively. Determine the percentage composition of the compound.  : Kaysons Education

# 0.92 G Of An Organic Compound Containing Carbon, Hydrogen And Oxygen Was analysed by Combustion Method. The Increase In Mass Of The U-tube And The Potash Bulbs At The End Of The Operation Was Found To Be 1.08 G And 1.76 G, Respectively. Determine The Percentage Composition Of The Compound.

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## Question

### Solution

Correct option is

C = 52.17%; H = 13.04%, O = 34.79%.

Increase in mass of U-tube = 1.08 g

Mass of water formed = 1.08 g

Since, 18 g of water contain hydrogen = 2 g

1.08 g of water contain hydrogen

Mass of compound taken for analysis = 0.92 g

Percentage of hydrogen

Increase in mass of potash bulbs = 1.76 g

Mass of carbon dioxide formed = 1.76 g

Since, 44 g of carbon dioxide contain carbon = 12 g

1.76 g of carbon dioxide contain carbon

Percentage of carbon

= 52.17.

Percentage of oxygen = 100 – (per cent of C + per cent of H)

= 100 – (52.17 + 13.04)

= 100 – 65.21

= 34.79

Composition of the compound : C = 52.17%; H = 13.04%, O = 34.79%.

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