1)4FeCr2O7+ 8K2CO3 + 1 O22Fe2O3+ 8K2CrO4 + 8CO2 (a) How many molesof FeCr2O7are required to produce 44 molesof CO2? (b) How many moles of O2are required to produce 107.9 molesof Fe2O3? (c) If 309 molesof FeCr2O7react, how many molesof O2will be consumed?

the product of the pressure and volume is also constant

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