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Percentage of an element in a molecule with a given structure

This type of question, asked 2 times: 24 Jan 2023, 7 Apr 2025. All 2 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    24 Jan 2023

    56
    Uracil is a base present in RNA with the following structure. % of NN in uracil is

  2. Question 2

    7 Apr 2025

    47
    Thyroxine, the hormone has given below structure The percentage of iodine in thyroxine is ____ %\%. (nearest integer) (Given molar mass in gmol−1C:12.H:1,O:16g{mol}^{- 1}C:12.H:1,O:16, N:14, I:127)