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WorksheetsIGCSE Edexcel Moles
Total questions: 20
Worksheet time: 1hrs 2mins
moles of gases =
conc x vol
vol/24 (in dm3)
vol/24 (in cm3)
mass/Mr
moles of a solid =
mass/Mr
mass x Mr
vol/conc
vol x conc
Moles of a solution =
conc x vol
vol/conc
conc/vol
vol x 24000
Volume of a solution =
moles x conc
mol/conc
conc/mol
moles x 24 (in dm3)
volume of a gas =
24 000 cm3 x moles
24 cm3 x moles
24 dm3 / moles
moles / 24dm3
What volume does 6 moles of methane occupy in cm3? (units not required in answer)
(a)
What is the mass of 6dm3 of chlorine in grams? (units not required in answer.
(a)
Find the volume of H2O gas formed (at room temperature and pressure, in cm3) when 11.0 g of propane burns in oxygen. (Units not required in answer)
C3H8(g) + 5O2(g) -> 3CO2(g) + 4H2O(l)
(a)
591.5g of hydrated potassium manganate crystals (KMnO4.nH2O) gave 276.5g of anhydrous potassium manganate on heating to constant mass. Work out the formula mass of the hydrated potassium manganate and so the value of n.
KMnO4.nH2O → KMnO4 + n H2O
(a)
25.0 cm3 of sodium carbonate solution neutralises 26.2 cm3 of 0.550 mol/dm3 nitric acid solution.
2 HNO3(aq) + Na2CO3(aq) → 2 NaNO3(aq) + CO2(aq) + 2 H2O(l)
Calculate the concentration of sodium carbonate, giving your answer to a suitable level of precision. (units are not required in the answer).
(a)
What volume (in cm3) of 2.75 mol/dm3 potassium hydroxide reacts with 25.0 cm3 of 1.15 mol/dm3 nitric acid? Give your answer to 3 significant figures.
KOH(aq) + HNO3(aq) → KNO3(aq) + H2O(l)
(units are not required in your answer)
(a)
An indicator...
tells you the pH
tells you if a solution is acidic or alkaline
tells you the acidity
is colourless in acids
Phenolphthaleine in acidic solutions is...
blue
orange
pink
colourless
We use a white tile in titrations...
to see the colour change clearly
because indicators are clear
to protect the bench from heat
to protect the bench from acids
Which of the following is not an essential step in a titration?
swirling the flask
adding 10cm3 of indicator
taking burette readings to the nearest 0.05cm3
adding solution drop-by-drop near the end point
How many moles of HCl are there in 25cm3 if the solution has a concentration of 0.125 mol/dm3? (give your answer as a decimal)
(a)
What is the concentration, in mol/dm3, of 0.3mol of NaOH dissolved in 400cm3?
(you do not need to include units in your answer)
(a)
What mass, in g, of NaOH is needed to make 25cm3 of 0.1 mol/dm3 solution?
(you do not need to give units in your answer).
(a)
What is the maximum mass, in g, of Al that can be formed from 35.7g of aluminium oxide in the following reaction?
Al2O3 + 3Mg -> 2Al + 3MgO
(you do not need to include units in your answer)
(a)
How many moles of O2 are there in 6.4g?
0.2
0.1
204.8
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