Which one of the following statements is true?

Asample of the male sex hormone testosterone, c19h28o2, contains 3.88×10^21 atoms of hydrogen.(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?

The reaction q+r2=r2q is found to be first order in r2 and

Ineed to find the answer of this question because i dont understand it