SCH 3U – MOLE CALCULATIONS

1. / Calculate the mass of
a) 2.00 moles of water
b) 4.38 moles of chlorine
c) 0.025 moles of ammonia
d) 1.8 moles of oxygen gas
2. / Calculate the number of moles in
a) 25 g of helium
b) 12.5 g of methane
c) 0.364 g of iodine vapour
d) 40.0 g of sodium
3. / Calculate the number of particles in
a) 2.50 moles of Neon
b) 0.050 moles of iron
4. / Calculate the number of moles in
a) 9.03 X 1023 atoms of Cu
b) 3.76 X 1025 molecules of SO2
c) 8.6 X 1018 electrons
5. / Calculate the number of molecules in
a) 12.5 g of nitrogen
b) 0.76 g of ammonia
c) 0.60 g of hydrogen gas
6. / Calculate the mass of
a) 4.25 X 1024 atoms of C
b) 6.02 X 1021 molecules of H2O
c) one trillion atoms of Zn
d) one atom of U

MORE MOLE QUESTIONS

1. / How many particles are there in one mole?
2. / It is estimated that a sample of matter contains 1.38 X 1025 atoms. How many moles are present in the sample?
3. / How many moles of barium are present in a sample having a mass of 22.3 grams?
4. / A chemical reaction requires 3.7 moles of boron. What mass, in grams, of boron must be used in the reaction?
5. / A sample of naturally occurring carbon has a mass of 1.732 grams. Calculate the number of moles of carbon in this sample.
6. / A chemical reaction results in 57.2 grams of the gas carbon dioxide, CO2. How many molecules of gas were produced?
7. / Calculate the mass of one trillion molecules of oxygen gas.
8. / Calculate the number of moles in:
a) 25 grams of oxygen gas
b) 0.27 g of ammonia
c) 10.5 g of sodium
d) 347 g of ammonium nitrate
9. / Calculate the mass, in grams, of:
a) 1.24 moles of water
b) 0.269 moles of mmonium chloride
c) 5.62 moles of sodium hydroxide
d) 2.35 moles of sodium sulphate
10. / Calculate the number of molecules in:
a) 3.00 moles of chlorine gas
b) 3.00 moles of uranium hexafluoride
c) 3.00 moles of hydrogen chloride gas
d) 3.00 moles of any kind of molecule

EVEN MORE MOLE QUESTIONS - Grams, Moles and Molecular Mass Worksheet

1. / What is the mass of 0.100 mol of each of the substances given below:
(a) Sodium carbonate
(b) Ammonium tetraborate, (NH4)2B4O7
(c) Calcium cyclamate, Ca(C6H12NSO3)2
2. / How many moles of sodium nitrate are in 1.70 grams of sodium nitrate, a substance used in fertilizers and to make gunpowder.
3. / Ammonium sulphate, is a fertilizer used to supply both nitrogen and sulphur. How many grams of ammonium sulphate are in 35.8 moles of ammonium sulphate.
4. / A 0.500 mol sample of table sugar, C12H22O11, weighs how many grams?
5. / A solution of zinc chloride, in water is used to soak the ends of wooden fenceposts to preserve them from rotting while they are stuck in the ground. One ratio used is 840 grams of zinc chloride to 4 L water. How many moles of zinc chloride are in 840 grams of zinc chloride?
6. / In the early 1970s, thallium sulphate, a powerful poison, was illegally used in poison baits to control predators such as coyotes on western rangelands. Hundreds of eagles died after taking these baits. A 1.00 kilogram can of thallium sulphate contains how many moles of this compound?
7. / Borazon, one crystalline form of boron nitride, is very likely the hardest of all substances. If one sample contains 3.02 X 1023 atoms of boron, how many atoms and how many grams of nitrogen are also in this sample?
8. / If iodine is not in a person's diet, a thyroid condition called goitre develops. Iodized salt is all that it takes to prevent this disfiguring condition. Calcium iodate, is added to table salt to make iodized salt. How many atoms of iodine are in 0.500 moles of calcium iodate? How many grams of calcium iodate are needed to supply this much iodine?
9. / Ammonium carbonate is used as a fertilizer and to manufacture explosives. How many atoms of nitrogen are in 0.665 moles of this substance? How many grams of ammonium nitrate supply this much nitrogen?
10. / Sodium perborate, is present in "oxygen bleach". It acts by releasing oxygen, which has bleaching ability. How many grams of sodium perborate are in 4.65 moles ofthis substance?
11. / Barium sulphate, is given to patients as a thick slurry in flavoured water before X-rays are taken of the intestinal tract. The barium blocks the X-rays, and the tract therefore casts a shadow that is seen on the x-ray film. How many grams are in 0.568 mole of barium sulphate.
12. / Calculate the number of grams in 0.586 mole of each of the following substances?
(a) Water.
(b) Glucose, a sugar in grape juice and honey.
(c) Iron.
(d) Methane.
13. / Calculate the number of moles of each substance in 100.0 grams of each of the following samples:
(a) Ammonia
(b) Cholesterol, C27H46O
(c) Gold
(d) Ethyl alcohol
14. / Why does 100.0 grams of ammonia, have so many more moles than 100.0 grams of cholesterol, C27H46O?
15. / A sample of a compound with a mass of 204 grams consists of 1.00 x 1023 molecules. What is its formula weight?