A sample of the male sex hormone testosterone, C_{19}H_{28}O_{2}, contains 7.04 10^{20} hydrogen atoms

a) How many atoms of carbon does it contain?

b) How many molecules of testosterone does it contain?

c) How many moles of testosterone does it contain?

d) What is the mass of this sample in grams?

Thank you for the opportunity to help you with your question!

SOLUTION:

(a) 19 : 28 = x : 7.04 x 10^20

Solve for x, we have:

x = atoms of C = 4.78 x 10^20 (b) 7.04 x 10^20 / 28 = 2.51 x 10^19 (c) 2.51 x 10^19 / 6.02 x 10^23 =4.17 x 10^-5 (d) Molar mass = 288 g/mol x 4.17 x 10^-5 =0.0120 g

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