Question:
Uracil is a base present in RNA with the following structure $\%$ of $N$ in uracil is ___
Uracil is a base present in RNA with the following structure $\%$ of $N$ in uracil is ___
Updated On: Mar 21, 2025
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Correct Answer: 25
Solution and Explanation
Molecular formula of uracil: \( \text{C}_4\text{H}_4\text{N}_2\text{O}_2 \).
Molar mass:
\[
\text{C} = 12 \times 4 = 48 \, \text{g mol}^{-1}, \quad \text{H} = 1 \times 4 = 4 \, \text{g mol}^{-1}, \quad \text{N} = 14 \times 2 = 28 \, \text{g mol}^{-1}, \quad \text{O} = 16 \times 2 = 32 \, \text{g mol}^{-1}.
\]
\[
\text{Molar mass of uracil} = 48 + 4 + 28 + 32 = 112 \, \text{g mol}^{-1}.
\]
Percentage of nitrogen:
\[
\% \text{N} = \frac{\text{Mass of N}}{\text{Molar mass}} \times 100 = \frac{28}{112} \times 100 = 25\%.
\]
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Concepts Used:
Biomolecules
Biomolecules are the most essential organic molecules, which are involved in the maintenance and metabolic processes of living organisms. These non-living molecules are the actual foot-soldiers of the battle of sustenance of life.
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