SCH 3U – MOLE CALCULATIONS



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 nitrate 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 of this 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? |

................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download