Here are some basic lab safety rules. Read through them and write at least a page. THEY ARE OBVIOUSLY ALL IMPORTANT...GO INTO DETAIL ABOUT A FEW AND ELABORATE ON THEIR IMPORTANCE.
Avoid skin and eye contact with all chemicals.
Minimize all chemical exposures.
No horseplay will be tolerated.
Assume that all chemicals of unknown toxicity are highly toxic.

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

answerca air mass;