1. Some rockets use hydrogen gas as a fuel. When hydrogen burns in oxygen it forms water
vapour. Calculate the volumes of
a) O2 (g) used and
b)
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water, H2O (g), produced if 960 d𝑚 of hydrogen gas, H2 (g), were burned in oxygen
(Ar: H = 1; O = 16).
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Assume 1 mole of any gas occupies a volume of 24 d𝑚
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3
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2. 40 c𝑚 of 0.2 mol/d𝑚 solution of hydrochloric acid just neutralised 20 c𝑚 of sodium
hydroxide solution in a titration. What is the concentration of sodium hydroxide solution in
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g/d𝑚 used in this neutralisation reaction?
3. Chemists usually carry out reactions using solutions. If they know the concentration of the
solution(s) they are using, they can find out the quantities reacting.
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Calculate the volume of 1 mol/d𝑚 solution of H2SO4 required to react completely with 6 g
of magnesium. (Ar: Mg = 24).
4. How much copper(II) oxide could be formed if 16 g of copper reacted with 20g of oxygen
gas?
.