Thyroxine has the formula C₁₅H₁₁I₄NO₄ and a molar mass of 776.87 g/mol…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Thyroxine has the formula and a molar mass of . Iodine has a molar mass of . A tablet holds of thyroxine. Find the percentage of iodine in thyroxine, the mass of iodine in the tablet and the amount of thyroxine in the tablet in micromoles.
Need a reminder? The key ideaShow
In B-DNA the base pairs are apart and there are about base pairs in a turn. A codon is three bases, and a stop codon does not code for an amino acid. The mass fraction of an element in a molecule is .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Percentage. , which is .
Step 2. Mass of iodine. micrograms.
Step 3. Amount. micromoles.
Answer: , micrograms and micromoles.
Check. The amount of iodine, micromoles, times gives micrograms.
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