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Summary Unit 3 moles calculations questions
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Here are some questions for unit 3 applied science level 3 for calculations involving moles.
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C4 – Mole Calculations (Hard)You will need the use the following.
Number of moles (n) = mass (m) Concentration (C or M) = number of
moles (n)
Mr Volume (V)
1 mole is 6.02 x 1023 (exactly as how 1 dozen is 12).
1 mole of any gas takes up 24 dm3 at standard condition (25 °C and 1
bar).
1. How many molecules are there in 79 g of Fe2O3? How many atoms is this?
2. How many moles are there in 132 g of CO2? How many dm3 would this be?
3. 58.5 g of sodium iodide are dissolved in 0.5 dm3. What concentration would
this be?
4. 392 dm3 of a gas are dissolved in 2.65 dm3 of a solvent. What is the
concentration of the resulting solution?
5. 48 dm3 of a gas has a mass of 262 grams. How many moles is this? What is
the Mr? What must this element be?
6. 1.2 x 1024 molecules are dissolved in 670 ml, what is the concentration?
7. A metal reacts with 8 g of oxygen molecules to form 15 g of a basic oxide.
What is the metal? Remember metal oxides are M2O, MO or M2O3 (M =
Metal ion).
8. 1.24 g of calcium carbonate is reacted with 15 ml of 1 M hydrochloric acid.
How many dm3 of gas are formed? How many atoms are there in this gas?
You will need the use the following.
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