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REVISION FROM LESSON 1
How many moles?
1) Jahin weighs a sample of CaCO3 and records a mass of 5.0 g. How many moles of
calcium carbonate are present?
2) Fatima measures out 50 cm3 of 0.1 moldm-3 hydrochloric acid. How many moles
of hydrochloric acid are present?
3) Hussain collects 48 cm3 of carbon dioxide in a gas syringe. How many moles of
carbon dioxide are present?
Using Chemical Equations
Chemical Equations show the ratio in which different species react in a chemical equation.…read more

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This equation shows that 6 moles carbon dioxide of react with 6 mole of water to make 1
mole of glucose and 6 moles of oxygen.
6: 6: 1: 6
a) How many moles of water are needed to react with 0.03 moles of carbon dioxide?
b) How many moles of glucose can you make from 0.03 moles of carbon dioxide?
c) How many moles of oxygen can you make from 0.…read more

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What mass of hydrogen is produced when 192 g of magnesium is reacted with
hydrochloric acid?
Mg + 2 HCl MgCl2 + H2 (3)
2) What mass of oxygen is needed to react with 8.5 g of hydrogen sulphide (H2S)?
2 H2S + 3 O2 2 SO2 + 2 H2O (3)
3) What mass of potassium oxide is formed when 7.…read more

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What mass of aluminium oxide is produced when 135 g of aluminium is burned in oxygen?
2 Al + 3 O2 Al2O3 (3)
6) What mass of iodine is produced when 7.…read more

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What mass of calcium carbonate is required to produce 1.2 dm3 of carbon dioxide?
CaCO3 CaO + CO2 (3)
11) What mass of magnesium oxide is formed when magnesium reacts with 6 dm3 of oxygen?
2 Mg + O2 2 MgO (3)
12) What volume of carbon dioxide is produced when 5.…read more

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