9) how many grams of carbon dioxide can be formed from the decomposition of 35.6
grams of calcium carbonate?

15.7 g CO2

Explanation: Solution attached:

CaCO3 => CaO + CO2

Convert mass of CaCO3 to moles.

Use the mole ratio of CaCO3 and CO2 from the balanced equation.

Convert moles of CO2 to mass using its molar mass.

what is the volume occupied by 40 grams of argon gas (ar) at standard conditions? what volume, in liters, is occupied by 1.5 x 1023 

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