Mole Conversions - Practice Problems
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mole conversions - practice problems
It is important to be able to convert between units of mass and volume measurement and ‘moles.’ The mole is a
unit for counting atoms and molecules representing 602,000,000,000,000,000,000,000 particles. This is often written as
6.02 × 10
23
particles and is known as ‘Avogadro’s number.’ Using the periodic table it is possible to calculate the ‘molar
mass,’ or the mass of a single mole of a substance. The ‘molar volume’ is the volume of a single mole of gaseous
substance. All gases have the same molar volume when measured at standard temperature and pressure or STP, which
is 22.4 liters per mole.
mole conversion chart
example:
Calculate the number of molecules in 1.62 grams of calcium chloride,
CaCl
.
mass
2
(grams)
grams → moles → particles
-develop a strategy:
⎛
⎞
1 mol
-calculate and solve:
⎝ ⎜
⎠ ⎟
22.4 L
amount
volume
(moles)
(liters)
⎛
⎞
⎛
⎞
6.022 ×10
23
1 mol
particles
×
×
1.62 g CaCl
⎝ ⎜
⎠ ⎟
⎝ ⎜
⎠ ⎟
2
111 g
1 mol
particles
= 8.79 ×10
21
particles of CaCl
2
= 8.79 ×10
21
particles of CaCl
2
practice problems:
1. A sample of neon has a volume of 75.8 L at STP . Calculate the number of moles.
2. Calculate the mass of an 8.4 mole sample of iron.
3. Convert 0.45 g of sodium hydroxide, NaOH, into moles.
4. Calculate the number of molecules in a sample of carbon dioxide with a mass of 168.2 grams.
5. Calculate the number of moles of potassium nitrate, KNO
, in a sample with a mass of 85.2 grams.
3
6. Calculate the mass of 0.94 moles of sodium bicarbonate, NaHCO
.
3
7. Convert 7.8 liters of carbon tetrafluoride, CF
, to grams.
4
8. Calculate the mass of 3.47x10
23
gold atoms.
9. Calculate the volume, in liters, of 7500 g of helium atoms. Assume STP conditions.
10. Calculate the number of particles in 5.0 grams of NaCl.
11. Calculate the mass of 5.0x10
14
molecules of water.
12. Calculate the volume of 5.0 grams of NO gas at STP.
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