Question

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?

Answer 1

I'm pretty sure it's 9726 milligrams of iodine. Hope this helps.

Answer 2

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,
`C_(15)H_(11)NO_4I_4`

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