JEE MAIN - Chemistry (2025 - 7th April Morning Shift - No. 25)
Thyroxine, the hormone has given below structure
_7th_April_Morning_Shift_en_25_1.png)
The percentage of iodine in thyroxine is __________ %. (nearest integer)
(Given molar mass in $\mathrm{g} \mathrm{mol}^{-1} \mathrm{C}: 12, \mathrm{H}: 1, \mathrm{O}: 16, \mathrm{~N}: 14, \mathrm{I}: 127$ )
Explanation
_7th_April_Morning_Shift_en_25_2.png)
$\rightarrow$ Molecular formula of Thyroxine $\Rightarrow$ $\mathrm{C}_{15} \mathrm{H}_{11} \mathrm{O}_4 \mathrm{NI}_4$
$\rightarrow$ Molecular mass of Thyroxine -
$$\begin{aligned} & \mathrm{C} \rightarrow 15 \times 12=180 \\ & \mathrm{H} \rightarrow 11 \times 1=11 \\ & \mathrm{O} \rightarrow 16 \times 4=64 \\ & \mathrm{~N} \rightarrow 14 \times 1=14 \\ & \mathrm{I} \rightarrow 127 \times 4=508 \end{aligned}$$
$\rightarrow$ Molecular mass of Thyroxine $\Rightarrow 777$
$$\begin{aligned} & \rightarrow \% \text { of Iodine }=\frac{508}{777} \times 100 \\ & =65.38 \% \\ & \text { Nearest integer }=65 \end{aligned}$$
Comments (0)
