P.) 3. A manufacturer selected a metal to use in producing a lightweight button for clothing. A metal that has a
density of 10.5 g/cm3 was selected.
Metal
Mass (g) Volume (cm3)
1
22.1
3.00
2
42.0
4.00
3
9.32
5.00
4
8.13
3.00

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