Edexcel International A Level Chemistry

Topic Questions

International A LevelChemistryEdexcelTopic Questions1. Structure, Bonding & Introduction to Organic Chemistry1.2 Amount of Substance

1.2 Amount of Substance

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1
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The high resolution mass spectrum of a compound X has a molecular ion peak at m / z = 44.0632. Accurate relative atomic masses are given in the table. 

Element Relative atomic mass
Hydrogen 1.0079
Carbon 12.0000
Oxygen 15.9949

Which of these compounds, with a relative molecular mass of 44, gives rise to this peak? 

q12-paper-4-2021-june-edexcel-ial-chemistry

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1
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Which aqueous solution has the highest concentration, in mol dm-3, of chloride ions?

  • 0.1 g dm-3 HCl

  • 0.1 g dm-3 NaCl

  • 0.1 g dm-3 KCl

  • 0.1 g dm-3 BaCl2

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2
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A 4.00 mol dm−3 solution of an acid is used to prepare dilute solutions of the acid.

What volume of water is required to make up 150 cm3 of 0.35 mol dm−3 solution of the acid?

  • 13.1 cm3

  • 52.5 cm3

  • 97.5 cm3

  • 136.9 cm3

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1a
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The maximum permitted concentration of sulfur in diesel fuel is 10 mg of sulfur in 1 kg of diesel fuel.

a)
What is this concentration of sulfur in ppm?

  • 0.00001

  • 0.01

  • 10

  • 10000

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1b
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b)

3.2 kg of this diesel fuel is burned in air.

What is the maximum volume, in dm3, of sulfur dioxide which can be produced, measured at room temperature and pressure (r.t.p.)?

[Molar volume of a gas at r.t.p. = 24 dm3 mol−1]

  • 0.024

  • 0.77

  • 2.4

  • 24

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2
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A mass of 4.179 g of hydrated iron(III) sulfate, Fe2(SO4)3·H2O, was dissolved in deionised water and the solution made up to 200 cm3 .

What is the concentration of sulfate ions, SO42-, in the solution, in mol dm−3?

[Molar mass of Fe2(SO4)3·H2O = 417.9 g mol−1]

  • 0.01

  • 0.05

  • 0.10

  • 0.15

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3a
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A mass of 0.23 g of sodium was added to 350 cm3 water to form hydrogen and a solution of sodium hydroxide.

Na (s) + H2O (l) → NaOH (aq) + 1⁄2H2 (g)

a)
What is the concentration, in mol dm−3, of sodium hydroxide in the solution formed?

  • 0.010

  • 0.029

  • 0.29

  • 0.66

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3b
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b)

What is the maximum volume, in cm3, of hydrogen which could be formed, measured at r.t.p.?

[Molar volume of a gas at r.t.p. = 24 dm3 mol−1]

  • 120

  • 240

  • 480

  • 2800

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3c1 mark
c)

The sodium hydroxide solution was neutralised with sulfuric acid.

Which is the ionic equation for this reaction?

  • H+ (aq) + OH− (aq) → H2O (l)

  • Sbegin mathsize 16px style O subscript 4 to the power of 2 minus sign end style (aq) + 2Na+ (aq) → Na2SO4 (aq)

  • H2SO4 (aq) + 2Na+ (aq) + 2OH− (aq) → Na2SO4 aq) + 2H2O (l)

  • 2H+ (aq) + Sstraight O subscript 4 superscript 2 minus end superscript (aq) + 2Na+ (aq) + 2OH− (aq) → 2Na+ (aq) + Sstraight O subscript 4 superscript 2 minus end superscript (aq) + 2H2O (l)

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3d
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d)
Sodium hydroxide solution was added to magnesium sulfate solution.

The equation for the reaction is shown.

2NaOH(aq) + MgSO4(aq) → Mg(OH)2(s) + Na2SO4(aq)

What is the atom economy (by mass) for the production of magnesium hydroxide?

[Ar values: H = 1.0 O = 16.0 Na = 23.0 Mg = 24.3 S = 32.1]

  • 29.1%

  • 41.0%

  • 48.4%

  • 50.0%

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4
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Which conversion has the lowest percentage atom economy (by mass) for the formation of CaCl2?

  • Ca + Cl2 → CaCl2

  • Ca + 2HCl → CaCl2 + H2

  • CaCO3 + 2HCl → CaCl2 + H2O + CO2

  • CaCO3 + 2NaCl → CaCl2 + Na2CO3

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5
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The concentration of nitrogen dioxide in a sample of air is 0.5 ppm.
What is the percentage of nitrogen dioxide molecules in this sample of air?

  • 0.5%

  • 0.005%

  • 0.00005%

  • 0.0000005%

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6
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The equation for the complete combustion of propan-1-ol is shown.

C3H7OH(l) + 4 1⁄2O2(g) → 3CO2(g) + 4H2O(l)

2.00 × 10−3 mol of propan-1-ol undergoes complete combustion.

What mass of carbon dioxide is formed?

  • 0.0293g

  • 0.0880g

  • 0.132g

  • 0.264g

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7
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A student is provided with 25.0 cm3 of 1.00 mol dm–3 hydrochloric acid.

What volume of distilled water should the student add to this solution to make a 0.0500 mol dm–3 solution?

  • 25.0 cm3

  • 50.0 cm3

  • 475 cm3

  • 500 cm3

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8
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Iron(III) oxide is reduced by hydrogen in a two-step process.

Step 1: 3Fe2O3 + H2 → 2Fe3O4 + H2O
Step 2: Fe3O4 + 4H2 → 3Fe + 4H2O


What is the maximum mass of iron that could be produced from 39.9 tonnes of Fe2O3 ?
[Ar values: H = 1.0 O = 16.0 Fe = 55.8]   

  • 6.98 tonnes

  • 13.95 tonnes

  • 27.90 tonnes

  • 41.85 tonnes

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9
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Which of these gases occupies 6.0 dm3 at room temperature and pressure (r.t.p.)?

[molar volume of gas at r.t.p. = 24.0 dm3 mol−1

Ar values: He = 4.0 C = 12.0 N = 14.0 O = 16.0]

  • 2.0 g of helium

  • 4.0 g of oxygen

  • 11.0 g of carbon dioxide

  • 14.0 g of nitrogen

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10
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How many moles are there in 15.1 cm3 of liquid propan-1-ol?

[Density of propan-1-ol = 0.80 g cm−3      Mr of propan-1-ol = 60]

  • (0.80 × 15.1) ÷ 60

  • 0.80 ÷ (60 × 15.1)

  • 60 ÷ (0.80 × 15.1)

  • (60 × 15.1) ÷ 0.80

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11
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Which of these solutions contains the greatest number of ions?

  • 20.0 cm3 of 0.5 mol dm−3 KCl

  • 0.40 dm3 of 0.03 mol dm−3 KCl

  • 10.0 cm3 of 0.6 mol dm−3 CaCl2

  • 0.15 dm3 of 0.04 mol dm−3 CaCl2

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12
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What volume, in dm3, of hydrogen gas will be produced when 3.00 g of lithium is reacted with water at room temperature and pressure (r.t.p.)?

2Li + 2H2O → 2LiOH + H2

[Molar volume of gas at r.t.p. = 24.0 dm3 mol–1]

  • 0.217

  • 0.435

  • 5.22

  • 10.4

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13
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Potassium chlorate(V) decomposes on heating to form oxygen.

2KClO3 → 2KCl + 3O2

What is the atom economy (by mass) for the formation of oxygen?
[Ar values: O = 16.0 Cl = 35.5 K = 39.1]

  • 13.1%

  • 26.1%

  • 39.2%

  • 64.3%

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14
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10.00 g of hydrated magnesium sulfate, MgSO4•7H2O, is heated to remove the water of crystallisation.

What mass of anhydrous magnesium sulfate, MgSO4, is formed?

[Molar mass of MgSO4•7H2O = 246.4 g mol−1 ]

  • 2.84 g

  • 4.89 g

  • 5.11 g

  • 7.16 g

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15
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Propane burns completely in oxygen as shown.

C3H8 (g) + 5O2 (g) → 3CO2 (g) + 4H2O (l)

100 cm3 of propane was mixed with 600 cm3 of oxygen and the mixture was ignited.

What is the total volume, in cm3, of the gas mixture at the end of the reaction?

All gas volumes were measured at room temperature and pressure.

  • 300

  • 400

  • 700

  • 800

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16
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Barium chloride solution, BaCl2 (aq), reacts with gallium sulfate solution, Ga2(SO4)3 (aq) to form a precipitate of barium sulfate, BaSO4 (s).

What is the minimum volume of 0.100 mol dm−3 barium chloride needed to precipitate all the sulfate ions in 200 cm3 of 0.05 mol dm−3 gallium sulfate?

  • 100 cm3

  • 200 cm3

  • 300 cm3

  • 400 cm3

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17
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Which aqueous solution contains the greatest number of ions?

  • 200 cm3 of 1.5 mol dm−3 MgCl2

  • 400 cm3 of 0.8 mol dm−3 MgSO4

  • 500 cm3 of 1.0 mol dm−3 NaCl

  • 1000 cm3 of 0.25 mol dm−3 Na2SO4

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