Question:

$0.92 \,g$ of an organic compound was analysed by combustion method. The mass of the $U$-tube increased by $1.08 \,g$. What is the percentage of hydrogen in the compound?

Updated On: Jun 23, 2023
  • $13.04\%$
  • $52.317\%$
  • $65.21\%$
  • $11.30\%$
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The Correct Option is A

Solution and Explanation

Increase in mass of $U$-tube = $1.08\, g$ Mass of water formed = $1.08 \,g$ $18 \,g\, H_{2}O \equiv 2\, g\, H$ $1.08 \,g \,H_{2}O =\frac{2}{18} \times 1.08$ % of hydrogen $= \frac{2}{18} \times \frac{1.08}{0.92} \times 100=13.04\%$
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Concepts Used:

Organic Chemistry - Some Basic Principles and Techniques

Organic Chemistry is a subset of chemistry dealing with compounds of carbon. Therefore, we can say that Organic chemistry is the chemistry of carbon compounds and is 200-225 years old. Carbon forms bond with itself to form long chains of hydrocarbons, e.g.CH4, methane and CH3-CH3 ethane. Carbon has the ability to form carbon-carbon bonds quite elaborately. Polymers like polyethylene is a linear chain where hundreds of CH2 are linked together. 

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Importance of Organic Chemistry:

Organic chemistry is applicable in a variety of areas including-

  • Medicines: Example- Aspirin which is a headache medicine and Ibuprofen is a painkiller, both are organic compounds. Other examples include paracetamol.
  • Food: Example- Starch which is a carbohydrate is an organic compound and a constituent of rice and other grains. It is the source of energy.
  • Clothing: Example- Nylon, Polyester and Cotton are forms of organic compounds.
  • Fuels: Examples- Gasoline, Petrol and Diesel are organic compounds used in the automobile industry at large.