(10 points)
use the periodic table to determine how many atoms of phosphorus (p) are in a sample that has a mass of 172.90 g.

a. 3.48 × 1021 atoms

b. 1.97 × 1022 atoms

c. 3.36 × 1024 atoms

d. 1.04 × 1026 atoms

Which of the following warnings would an agricultural chemist tell a farmer who wants to recycle his or her own ammonia? recycling ammonia is a difficult process that sometimes takes weeks. recycling ammonia requires a degree in biochemistry or a related field. recycling ammonia can be harmful because it is highly flammable and toxic. recycling ammonia costs too much money considering the price of the necessary chemicals.