Use the periodic table to determine how many atoms of phosphorus (P) are in a sample that has a mass of 172.90 g.

3.48 × 1021 atoms

1.97 × 1022 atoms

3.36 × 1024 atoms

1.04 × 1026 atoms

Bridget is in science class. her teacher gives her two unknown substances and asks her to determine their relative ph. she places a piece of red litmus paper into both substances. the litmus paper turns purple when she places it into substance i. the litmus paper turns blue when she places it into substance ii. a. substance i is a neutral substance and substance ii is an acid. b. substance i is a neutral substance and substance ii is a base. c. substance i is an acid and substance ii is a base. d. substance i is a base and substance ii is a neutral substance.