An organic compound contains 69% carbon and 4.8% hydrogen, the remainder being oxygen. Calculate the masses of carbon dioxide and water produced when 0.20 g of this substance is subjected to complete combustion.
Solution and Explanation
Percentage of carbon in organic compound = 69 %
That is, 100 g of organic compound contains 69 g of carbon.
∴0.2 g of organic compound will contain= \(\frac{69}{100}=0.138\.g\,of\,C\)
Molecular mass of carbon dioxide, CO2 = 44 g
That is, 12 g of carbon is contained in 44 g of CO2 \(\frac{44×0.138}{12}\)= 0.506 g of CO2
Thus, 0.506 g of CO2 will be produced on complete combustion of 0.2 g of organic compound. Percentage of hydrogen in organic compound is 4.8.
i.e., 100 g of organic compound contains 4.8 g of hydrogen
Therefore, 0.2 g of organic compound will contain \(\frac{4.8}{100}=0.0096\,g\,of\.H\)
It is known that molecular mass of water (H2O) is 18 g.
Thus, 2 g of hydrogen is contained in 18 g of water.
∴0.0096 g of hydrogen will be contained in \(\frac{1.8×0.0096}{2}=0.0864\,g\) of wate
Thus, 0.0864 g of water will be produced on complete combustion of 0.2 g of the organic compound.
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Concepts Used:
Organic Chemistry – Some Basic Principles and Techniques - Reaction Mechanism
SN1 Reaction Mechanism:
SN1 reaction mechanism takes place by following three steps –
- Formation of carbocation
- Attack of nucleophile
- Deprotonation
SN2 Reaction Mechanism:
The SN2 reaction mechanism involves the nucleophilic substitution reaction of the leaving group (which generally consists of halide groups or other electron-withdrawing groups) with a nucleophile in a given organic compound.
Electrophilic Aromatic Substitution Reaction Mechanism:
The mechanism of an electrophilic aromatic substitution reaction contains three main components which are:
- A new sigma bond from C=C is formed during the reaction in the arene nucleophile.
- Due to the breaking of the C-H sigma bond, a proton is removed.
- The C=C bond is reformed and it restores the aromaticity of the compound.
Electrophilic Substitution Reaction Mechanism:
The electrophilic substitution reaction mechanism is composed of three steps, which will be discussed more below.
- Electrophile Generation
- Carbocation Formation
- Proton Removal