8. (16 pts) Reveratrol has been called a miracle molecule and even the fountain

Question

8. (16 pts) Reveratrol has been called a miracle molecule and even the fountain of youth. Primative organisms (yeast, fruit flies, some others) experience greatly expanded life spans when fed buckets of the chemical. Does it make humans live longer? That's not quite so clear, but plenty of companies sell resveratrol supplements in hope of capturing customers' imaginations. a. What is the molar mass of resveratrol (C14H1203)? 228 g mel b. How many molecules of resveratrol are present in a 200mg tablet that contains pure resveratrol?

Explanation / Answer

a)

Molar mass can be calculated as:

MW total = SuM( MW of species)

MW = 14 carbons * MW Carbon + 12 hydrogens * MW of Hydrogen + 3 oxygens * MW of Oxygen

MW = 14*12 + 12*1 + 3*16 = 228 g/mol approx

b)

in 200 mg --> 0.2 g

1 mol = 228 g

x mol = 0.2

x =0.2/228 = 0.000877 mol

1 mol = 6.022*10^23

0.000877 mol --> (0.000877)(6.022*10^23) = 5.2812*10^20 molecules of resveratrol

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