# Moles and mass WORKSHEET ```Moles, moles and more moles: Calculating moles from masses and vice-versa
Moles of atoms…
1.
Calculate the number of moles in
a. 40g of calcium
b. 46g of sodium
c. 14g of silicon
2. Calculate the mass of the following
a. 0.5 moles of magnesium
b. 2 moles of iron
c. 4 moles of chlorine
e. 216g of silver
f. 46g of tungsten
d. 1 mole of xenon
e. 3 moles of zirconium
f. 0.25 moles of mercury
Moles of compounds….
3. Calculate the number of moles in
a. 40g of sodium hydroxide NaOH
b. 35.5g of chlorine gas, Cl2
c. 159g of copper oxide CuO
4. Calculate the mass of the following
a. 0.5 moles of oxygen gas, O2
b. 10 moles of hydrogen gas, H2
c. 1 mole of cobalt chloride CoCl2
d. 0.5 moles of osmium tetroxide OsO4
d. 14g of potassium hydroxide KOH
e. 12g of lithium hydride LiH
f. 95g of fluorine gas F2
e. 2 moles of ethanol CH3CH2OH
f.
0.5 moles of magnesium hydroxide
Mg(OH)2
Trickier moles questions….
You will need to know something about these compounds before you can calculate the moles…. (CLUE: you will find
your table of common ions on the back of your Periodic Table very useful!) Give all answers to 1 decimal place.
5. Calculate the number of moles in 10g of the following compounds
a. Water
b. Sodium chloride
c. Bromine liquid
d. Magnesium chloride
e. Hydrochloric acid
6. Calculate the mass of 3 moles of the following compounds
a. Magnesium sulphate
b. Ammonium hydroxide
c. Barium sulphate
d. Nitric acid
e. Iron (III) oxide
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