Mole Calculations (n,m,gfm) – National 5 Chemistry Skills & Revision

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Revision Questions A B C D E
Calculating the mass of one mole (calculating gfm)
Calculating the mass of fractions of a mole.
Calculating the number of moles in a given mass.
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In these revision exercises you are asked to use the relationship between number of moles, gram formula mass and the mass of a substance to work out the answer.  You should be familiar with the triangle formula and how to manipulate it.   All answers have been calculated based on the RAM values detailed in the SQA National 5 databook, published in 2021.

Question 1:

Calculate the mass of one mole of the following compounds:

 a) CaO  b) KCl  c) NaBr
     
 d) LiCl  e) Fe2O3  f) PbBr4
     
g) iron chloride  h) copper (I) oxide i) calcium sulfide
     
j) copper (I) bromide k) sodium oxide l) calclium chloride
     
m) barium iodide  n) copper (II) oxide  o) calcium hydride
     

Question 2

Find the mass of each of the following:

 a) 0.2 moles of: aluminium bromide  b) 0.3 moles of:    c) 0.25 moles of: rubidium iodide
     
 d) 3 moles of: potassium oxide  e) 10 moles of: Iron (III) sulfide  f) 0.4 moles of: nitrogen chloride
     
 g) 12 moles of: Lead (II) Bromide  h) 2 moles of: copper bromide  i) 0.5 moles of: beryllium oxide
 j) 0.8 moles of: copper sulfide  k) 1.5 moles of: aluminium sulfide  l) 2.4 moles of: lead oxode

Question 3

Find the mass of each of the following:

 a) 2 moles of: magnesium hydroxide  b) 3 moles of: silver nitrate  c) 25 moles of: copper hydroxide
     
 d) 0.3 moles of: Iron thiosulfate  e) 1.3 moles of: lead nitrate  f) 2.4 moles of: beryllium sulfate
     
 g) 1.2 moles of: ammonium nitrate  h) 0.2 moles of: aluminium sulfate  i) 1.5 moles of: copper nitrate
 j) 4.8 moles of: Iron Hydroxide  k) 1.5 moles of: calcium nitrate  l) 24 moles of: ammonium carbonate
 m) 4.8 moles of: copper hydrgoen sulfite  n) 1.5 moles of: copper nitrate  o) 24 moles of: magnesium hydroxide

Question 4:

Calculate the number of moles in each of the following masses of compounds:

 a) 2 grams of: aluminium bromide  b) 3 grams of: calcium oxide  c) 25 grams of: potassium oxide
 d) 0.3 grams of: iron (III) oxide  e) 1.3 grams of: sodium oxide  f) 2.4 grams of: calcium hydride
 g) 1.2 grams of: barium iodide  h) 0.2 grams of: iron chloride  i) 1.5 grams of: copper (II) oxide
 j) 4.8 grams of: lead iodide  k) 1.5 grams of: lithium chloride  l) 24 grams of: calcium sulfide
 m) 4.8 grams of: potassium chloride n) 1.5 grams of: sodium bromide o) 24 grams of: copper (I) oxide

Question 5

Calculate the number of moles in the masses of the following compounds:

 a) 2 grams of: magnesium hydroxide  b) 3 grams of: silver nitrate  c) 25 grams of: copper hydroxide
 d) 33 grams of: Iron thiosulfate  e) 13 grams of: lead nitrate  f) 24 grams of: beryllium sulfate
 g) 12 grams of: ammonium nitrate  h) 2 grams of: aluminium sulfate  i) 15 grams of: copper nitrate
 j) 48 grams of: Iron Hydroxide  k) 1.5 grams of: calcium nitrate  l) 24 grams of: ammonium carbonate
 m) 4.8 grams of: copper hydrgoen sulfite  n) 15 grams of: copper nitrate  o) 24 grams of: magnesium hydroxide

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