1. How Many Oxygen Atoms Are in the Following?

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MOLES

1. How many oxygen atoms are in the following?

a) CaCO3 b) Al2(SO4)3

2. How many total ions are in the following?

a) CaCl2 b) NaF c) Al2S3

3. Perform the following mole-particle conversions.

a) How many ions of carbide (C4-) are there in 1.23 moles of carbide?

b) How many molecules of CO2 are in 4.56 moles of CO2?

c) How many atoms of iron are in 0.600 moles of iron?

d) How many moles are in 7.78 x 1024 formula units of MgCl2?

e) How many moles of water are 5.87 x 1022 molecules of water?

f) How many moles of aluminum are 1.2 x 1024 atoms of aluminum?

4. Calculate the number of particles (atoms, ions, formula units or molecules) in each of the following.

a) 3.4 moles Na2S b) 0.0020 moles Zn

c) 1.77 x 10-11 moles C d) 92.35 moles O2

5. Calculate the number of moles in each of the following.

a) 3.4 x 1024 molecules HCl b) 8.7 x 1021 atoms Zn

c) 1.77 x 1018 ions Al+3 d) 2.66 x 1026 atoms Cu

6. Calculate the molar mass of the each of the following elements.

a) sulfur (S) b) chromium (Cr) c) bromine (Br)

7. Calculate the molar mass of each of the following compounds.

a) Na2S b) N2O4 c) C6H12O6 d) Ca(NO3)2

8. Perform the following mass-mole conversions.

a) How many moles of magnesium are in 56.3 g of Mg?

b) How many moles is 5.69 g of NaOH?

c) How many grams of sodium chloride are in 3.45 moles of NaCl?

d) How many moles is 4.8 g of CO2?

e) How many grams is 9.87 moles of H2O?

9. Perform the following mass-particle conversions.

a) How many atoms of lithium are in 1.00 g of Li?

b) How many formula units of sodium oxide are in 42.0 g of Na2O?

c) How much would 3.45 x 1022 atoms of uranium (U) weigh?

d) How many molecules are in 6.8 g of CH4?

e) How much do 49.0 molecules of C6H12O6 weigh?

10. Perform the following volume conversions.

a) What is the volume of 4.59 mole of CO2 gas at STP?

b) How many moles is 5.67 L of O2 at STP?

c) What is the volume of 8.8 g of CH4 gas at STP?

d) How many grams is 16.2 L of O2 at STP?

11. Calculate the number of liters in each of the following.

a) 3.10 x 1024 molecules Cl2 b) 8.7 moles Ne

c) 2.77 x 1018 atoms He d) 266 grams SO2

Moles – page 1