Why is the water solubility of benzoic acid significantly less than the water solubility of the benzoate ion?

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?

Idon’t know how to solve this question

In this chemical reaction, 325 grams of barium (ba) react completely. how many moles of lithium (li) are produced?