For each of the following reactions, write a description of the given chemical equation. 2 Kl(aq) + Brz(1) 2 KBr(aq) + 12(s)

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?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

What natural processes produce large quantities of co2