JEE MAIN - Chemistry (2023 - 24th January Morning Shift - No. 17)
Uracil is a base present in RNA with the following structure. % of N in uracil is ___________
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Given:
Molar mass N = 14 g mol$$^{-1}$$
O = 16 g mol$$^{-1}$$
C = 12 g mol$$^{-1}$$
H = 1 g mol$$^{-1}$$
Answer
25
Explanation
Uracil is $\mathrm{C}_{4} \mathrm{H}_{4} \mathrm{~N}_{2} \mathrm{O}_{2}$
Mol. Wt of $\mathrm{C}_{4} \mathrm{H}_{4} \mathrm{~N}_{2} \mathrm{O}_{2}$ = 112
$\%$ by mass of $N=\frac{14 \times 2}{112} \times 100$
$$ =25 \% $$
Mol. Wt of $\mathrm{C}_{4} \mathrm{H}_{4} \mathrm{~N}_{2} \mathrm{O}_{2}$ = 112
$\%$ by mass of $N=\frac{14 \times 2}{112} \times 100$
$$ =25 \% $$
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