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Question

On Combustion Of 25g Of An Unknown Hydrocarbon Produces 88g of CO2 and 9g of H2O. This Unknown Hydrocarbon Contains:


A

18g of carbon and 7g of hydrogen

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B

20g of carbon and 5g of hydrogen

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C

22g of carbon and 3g of hydrogen

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D

24g of carbon and 1g of hydrogen

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Solution

The correct option is D

24g of carbon and 1g of hydrogen


The explanation for the Correct answer:

Option D 24g of carbon a1g of hydrogen

Step 1: Amount of Carbon in 88g of CO2

One mole of Carbon dioxide contains one mole of Carbon.

The given mass of Carbon dioxide is 88g

The molar masses of Carbon dioxide is 44g

The mass of Carbon is 12g
Therefore, the amount of Carbon in 88g of CO2=88gCO2×12gC44gCO2=24g
Thus, the amount of Carbon in 88g of CO2 is 24g.

Step 2: Amount of Hydrogen in 9g of H2O

From the molecular formula of H2O,

One mole of water contains two moles of Hydrogen.

The given mass of water is 9g

The molar masses of water is 18g

The mass of Hydrogen is 1g

Since water contains 2 moles of hydrogen, the mass is of Hydrogen in water is 2×1=2g

Therefore, the amount of Hydrogen in 9g of H2O =9gH2O×2gH18gH2O=1g

The amount of hydrogen in 9g of H2O is 1g

Therefore, The unknown hydrocarbon contains 24gof Carbon and 1g of Hydrogen, and option D is correct.


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