Identify the solutes and solvents for the following solutions: • salt (NaCl) in water, • air (a solution of 78% N2, 21% O2, and various other gases) • a solution of 30% ethanol and 70% water, • steel (an alloy of 95% iron and 1.5% carbon and 3.5% manganese) • CO2(g) in water. O2, water, NaCl, N2,carbon, co2,iron, ethanol

the correct answer to this question is 2

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