JEE Main 2025 Apr 7 Shift 1, Chemistry Q22: Proteins

JEE Main2025Apr 7, Shift 1Chemistry

Thyroxine, the hormone has given below structure

The percentage of iodine in thyroxine is ............ %. (nearest integer)

(Given molar mass in g mol $^{- 1}$ C:12. H:1, O:16, N:14, I:127)

Your answer

Solution

The molecular formula of thyroxine is C $_{15}$ H $_{11}$ I $_{4}$ NO $_{4}$ .

Compute the molar mass:

Mass percentage of iodine:

$% I = \frac{508}{777} \times 100 \approx 65.38%$

Rounded to the nearest integer: 65.

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