JEE Mains · Chemistry · STD 11 - 8.3. Organic chemistry purification and characterization
0.25 g of an organic compound "A" containing carbon, hydrogen and oxygen was analysed using the combustion method. The was an increase in mass of \(CaCl_{2}\) tube and potash tube at the end of the experiment. The amount was found to be 0.15 g and 0.1837 g, respectively. The percentage of oxygen in compound A is _______ %. (Nearest integer)
(Given: molar mass in g \(mol ^{-1} H : 1, C : 12, O : 16\))
- A 73%
- B 71%
- C 76%
- D 68%
Answer & Solution
Correct Answer
(A) 73%
Step-by-step Solution
Detailed explanation
\(\begin{array}{l}\quad { C _{ x } H _{ z }}+ O _2 \rightarrow CO _2+ H _2 O \\ t =0 \quad 0.25 gm \\ t _{ eq }\quad-\quad 0.18 gm \quad 0.15 gm \end{array}\) Mass of ' H ' \(=\frac{0.15}{18} \times 2=0.016 \simeq 0.017 gm\). Mass of ' O ' \(=0.25-0.05-0.017=0.1833 gm\) Mass…
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