In which reaction is a small molecule formed from the atoms removed from a single reactant molecule? addition condensation elimination substitution

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?

How have the greenhouse gasses increased from the year 2000 to 2018

Ineed ! i have no clue how to do this problem.