Unit # 5 - Calculations Based on Formulas
Gram/Mole Calculation

1.(a) Determine the mass of one mole of CO2
(b)
 Determine the number of atoms in one molecule of CO2
(c)
 Determine the number of atoms in one mole of CO2
(d)
 Determine the mass of 5.240 moles of CO2
(e)
 Determine the number of moles of CO2 in 85.4 g of CO2.

2(a)
 Determine the number of calcium ions, Ca2+, in one formula unit of Ca(OH)2.
(b)
 Determine the number of hydroxide ions, OH-, in one formula unit of Ca(OH)2.
(c)
 Determine the number of calcium ions, Ca2+, in 7.25 moles of Ca(OH)2.
(d)
 Determine the number of hydroxide ions, OH-, in 7.25 moles of Ca(OH)2.

3. Convert each of the following quantities to moles.
(a)
 12.5 g of Fe.
(b)
 12.5 g of Fe2O3.
(c)
 142.9 g of glucose, C6H12O6.
(d)
 82 g of gold.

4. Determine the number of grams present in the following samples.
(a) 0.800 mole of NaCl.
(b) 1.50 mole CO2.
(c) 7.25 mole Silicon.
(d) 5.663 mole of nitrogen gas.

5 (a) Determine the mass, in grams, of one atom of silver.
(b)
 Determine the mass, in grams, of one molecule of carbon dioxide.
(c)
 The mass of a milliliter of water weighs 1.000 g.
How many water molecules are present?
(d)
 How many chloride ions are present in 3.52 g of MgCl2?

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