A thin layer of gold was placed on a tray that measured 27.75 cm by 14.25 cm. The mass of the tray increased by 0.0624 g during the process. The density of gold is 19.32 g/cm3 . Calculate the thickness of the plating. I have very little idea as to how to go about solving this, and I need it for a chemistry assignment. Thanks

i think its 100.

hope this !

the right answer is c i just did the question.

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o