1. How many grams are contained in 0.44 moles of calcium?

(0.44 moles Ca) / 1

 

(40.08 g Ca) / (1 mole Ca)

  = 17.64 g Ca



2. Convert 4.54 moles magnesium carbonate to molecules

(4.54 moles MgCO₃) / 1

 

(6.022 x 10²³ atoms) / (1 mole MgCO₃)

  = 2.73 x 10²⁴ atoms MgCO₃



3. What is the mass of 4.1 x 10²⁰ molecules of carbon monoxide?

(4.1 x 10²⁰ molecules CO) / 1

 

(1 mole CO) / (6.022 x 10²³ atoms CO)

 

(28.01 g CO) / (1 mole CO)

  = 0.19 g CO



4. How many particles are contained in 1.67 g CaO?

(1.67 g CaO) / (1 mole CaO)

 

(1 mole CaO) / (56.06 g CaO)

 

(6.022 x 10 atoms CaO) / (1 mole CaO)

  = 1.79 x 10²² atoms CaO



5. The number of nitrogen molecules in 5.2 moles of N₂ is ________

(5.2 moles N₂) / 1

 

(6.022 x 10 atoms N₂) / (1 mole N₂)

  = 3.13 x 10²⁴ molecules N₂