The hormone thyroxine is secreted by the thyroid gland and has the formula: C15H17NO4I4. How many milligrams of Iodine can be extracted from 15.0 grams of thryoxine?

Question

asked Feb 17, 2017 2.9k views

2 Answers

Lorenzo Isidori · Answer 1 · 2017-02-20T18:40:21+0000

Answer : The mass of iodine extracted can be 9796.7 mg

Explanation : Given,

Mass of thryoxine = 15.0 g

Molar mass of thryoxine = 776.86 g/mole

The molecular formula of thryoxine is,

In
C_(15)H_(11)NO_4I_4 compound, there are 15 moles of carbon, 11 moles of hydrogen, 1 mole of nitrogen, 4 moles of oxygen and 4 moles of iodine.

First we have to determine the moles of thryoxine.

$\text{Moles of thryoxine}=\frac{\text{Mass of thryoxine}}{\text{Molar mass of thryoxine}}=(15.0g)/(776.86g/mole)=0.0193moles$

Now we have to determine the moles of iodine.

As, 1 mole of thryoxine has 4 moles of iodine

So, 0.0193 mole of thryoxine has
4* 0.0193=0.0772 moles of iodine

Now we have to determine the mass of iodine.

$\text{Mass of iodine}=\text{Moles of iodine}* \text{Molar mass of iodine}$

$\text{Mass of iodine}=(0.0772mole)* (126.9g/mole)=9.7967g=9796.7mg$

conversion used : (1 g = 1000 mg)

Therefore, the mass of iodine extracted can be 9796.7 mg