MHT CET · Chemistry · Some Basic Concepts of Chemistry
What is the mass percentage of carbon in urea? (mol. mass of urea \(=60 \mathrm{~g} \mathrm{~mol}^{-1}\) )
- A \(28 \cdot 0 \%\)
- B \(20 \cdot 0 \%\)
- C \(26.67 \%\)
- D \(46.67 \%\)
Answer & Solution
Correct Answer
(B) \(20 \cdot 0 \%\)
Step-by-step Solution
Detailed explanation
The molecular formula of Urea is:
We know,
Mass percentage of carbon in urea \(=\frac{\text { Molar mass of carbon }}{\text { molar mass of urea }} \times 100\)
Thus, the molar mass of Ureas \(=4 \times 1+12+2 \times 14+16=60\)
\(\therefore\) Mass percentage of Carbon in Ureas \(=\frac{12}{60} \times 100=20 \%\)
Hence, option A is correct.
We know,
Mass percentage of carbon in urea \(=\frac{\text { Molar mass of carbon }}{\text { molar mass of urea }} \times 100\)
Thus, the molar mass of Ureas \(=4 \times 1+12+2 \times 14+16=60\)
\(\therefore\) Mass percentage of Carbon in Ureas \(=\frac{12}{60} \times 100=20 \%\)
Hence, option A is correct.
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