You have a galvanized washer coated with zinc. You placed it into 25 mL of Hydrochloric acid for 15 minutes.

before the acid

The mass was 7.000 g

The radius was 1 cm

The diameter of the inner circle was 0.2 cm

The diameter of the outer circle was 0.4 cm

The height was 2 cm

after the acid this is what changed

the mass was 6.000 g

the radius was 0.500 cm

a. use the formula to find the coating thickness level: zinc dissolved/surface area total (m^2)?

b. what is the total surface area?

c. how much zinc dissolved ?

d. how many atoms are within the layer of the zinc depth?