18 terms

iGCSE Chemistry: Moles - core

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What do each of the following state symbols represent: (s), (l), (g), (aq)
(s) - solid. (l) - liquid. (g) - gas. (aq) - aqueous (in solution)
Calculate the relative formula mass(Mr) of ammonium nitrate (NH₄NO₃)
80
Calculate the relative formula mass(Mr) of calcium hydroxide (Ca(OH)₂)
74
Calculate the relative formula mass(Mr) of hydrated copper (II) sulfate (CuSO₄.5H₂O)
249.5
What are the units for amount in Chemistry?
Moles
What is the meaning of the word mole in Chemistry?
A mole is the amount of a substance found in its relative formula mass in grams (e.g. in 24g of Magnesium)
Using relative atomic mass (Aᵣ) and relative formula mass (Mᵣ), complete the following expression: amount (in moles) =
mass / Mr
Using relative atomic mass (Aᵣ) and relative formula mass (Mᵣ), complete the following expression: mass =
amount (in moles) x Mr
Using relative atomic mass (Aᵣ) and relative formula mass (Mᵣ), complete the following expression: Mᵣ =
mass / amount (in moles)
What mass of calcium bromide will fully react with 71g of chlorine?
200g
What mass of carbon dioxide is produced when 24g of carbon undergoes completely combustion?
88g
In the thermal decomposition of calcium carbonate, we might expect 50g of calcium carbonate to produce 28g of calcium oxide. If instead only 24g of calcium oxide is produced, what is the yield?
86%
State the expression for calculating % yield.
% yield = (actual amount of products/theoretical amount of products) x100
(Triple only) A sample of hydrogen chloride gas has a volume of 48 dm³. What amount of hydrogen chloride is this?
2 moles
(Triple only) State the expression for calculating molar volume of a gas.
Molar volume = amount (in moles) x 24 dm³ or 24,000 cm³
(Triple only) What is the meaning of the term Molar Volume?
The volume of 1 mole of gas at r.t.p is called the molar volume (24dm³ or 24000cm³)
(Triple only) What volume does 0.5 moles of ethene gas occupy (at rtp)
12 dm³
(Triple only) What volume does 3 moles of carbon dioxide gas occupy (at rtp)?
72 dm³