Mole Calculation Practice Worksheet
Name_____________________
1)
How many moles are in 25 grams of water?
2)
How many grams are in 4.5 moles of Li2O?
3)
How many molecules are in 23 moles of oxygen?
4)
How many moles are in 3.4 x 1023 molecules of H2SO4?
5)
How many molecules are in 25 grams of NH3?
6)
How many grams are in 8.2 x 1022 molecules of N2I6?
Answers:
1)
1.39 moles
2)
134.1 grams
3)
1.38 x 1025 molecules
4)
0.56 moles
5)
8.85 x 1023 molecules
6)
106.7 grams
Find the percent compositions of all of the elements in the following compounds:
1)
CuBr2
Cu: ___________
Br: ___________
2)
NaOH
Na: ___________
O: ___________
H: ___________
3)
(NH4)2S
N: ___________
H: ___________
S: ___________
4)
N2S2
N: ___________
S: ___________
Answers:
1)
Cu: 28.4%
Br: 71.6%
2)
Na: 57.5%
O: 40.0%
H: 2.5%
3)
N: 41.1%
H: 11.8%
S: 47.1%
4)
N: 30.4%
S: 69.6%
Empirical Formula Worksheet
Write the empirical formula for the following compounds.
1) C6H6
2) C8H18
3) WO2
4) C2H6O2
5) X39Y13
6. Nitrogen and oxygen form an extensive series of oxides with the general formula NxOy.
One of them is a blue solid that comes apart, reversibly, in the gas phase. It contains
36.84% N. What is the empirical formula of this oxide?
7. A sample of indium chloride weighing 0.5000 g is found to contain 0.2404 g of chlorine.
What is the empirical formula of the indium compound?
8. An unknown compound was found to have a percent composition as follows:
47.0 % potassium, 14.5 % carbon, and 38.5 % oxygen. What is its empirical formula?
9. Rubbing alcohol was found to contain 60.0 % carbon, 13.4 % hydrogen, and the
remaining mass was due to oxygen. What is the empirical formula of rubbing alcohol?
Answers
1) C6H6 C3H3
2) C8H18 C4H9
3) WO2 WO2
4) C2H6O2 CH3O
5) X39Y13 X3Y
6. N2O3.
7. InCl3
8. K2C2O4
9. C3H8O
Nomenclature Review:
Provide the name for:
Provide the formula for:
Cu(C2H3O2)2
tin (IV) phosphate
Fe3N2
lead (II) sulfide
Hg(NO2)2
copper (I) nitride
Sn(OH)4
mercury (II) sulfite
Pb(CO3)2
iron (III) nitrate
FeBr2
chromium (III) sulfate