Thyroxine, the hormone has given below structure The percentage of iodine in thyroxine is ............ %. (nearest integer) (Given molar mass in g C:12, H:1, O:16, N:14, :127) [2025]

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Solution

Q.
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) [2025]

Ans.
(65)

Molecular formula of thyroxin = $C_{15} H_{11} O_{4} {NI}_{4}$

Molar mass of thyroxin $(M_{thyroxine})$

$= 15 \times 12 + 11 \times 1 + 4 \times 16 + 1 \times 14 + 4 \times 127 = 777 g/mol$

Mass of iodine in 1 mol thyroxin $(M_{I})$ $= 4 \times 127 = 508 g$

Percentage of iodine in thyroxin $= \frac{M_{I}}{M_{thyroxine}} \times 100$

$= \frac{508}{777} \times 100 = 65.38 % \approx 65 %$

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