Relative masses of atoms and molecules — Paper 1 · IGCSE Chemistry (9-1) 0971

8 The equation for the reaction between magnesium and dilute sulfuric acid is shown. The Mr of MgSO4 is 120. Mg + H2SO4 → MgSO4 + H2 Which mass of magnesium sulfate is formed when 12 g of magnesium completely reacts with dilute sulfuric acid? A 5 g B 10 g C 60 g D 120 g

1 marks

Answer: C

This question in 0971/11 May/June 2018

9 The compound magnesium nitrate has the formula Mg(NO3)2. What is the relative formula mass of magnesium nitrate? A 86 B 134 C 148 D 172

1 marks

Answer: C

This question in 0971/11 May/June 2019

8 Aluminium oxide has the formula Al 2O3. Which statement about aluminium oxide is correct? A 2 g of aluminium atoms are combined with 3 g of oxygen atoms. B 2 g of aluminium atoms are combined with 3 g of oxygen molecules. C Aluminium oxide has a relative formula mass of 102. D Pure aluminium oxide contains a higher mass of oxygen than of aluminium.

1 marks

Answer: C

This question in 0971/11 May/June 2020

8 Aluminium oxide has the formula Al 2O3. Which statement about aluminium oxide is correct? A 2 g of aluminium atoms are combined with 3 g of oxygen atoms. B 2 g of aluminium atoms are combined with 3 g of oxygen molecules. C Aluminium oxide has a relative formula mass of 102. D Pure aluminium oxide contains a higher mass of oxygen than of aluminium.

1 marks

Answer: C

This question in 0971/12 May/June 2020

12 The relative atomic mass of chlorine is 35.5. When calculating relative atomic mass, which particle is the mass of a chlorine atom compared to? A a neutron B a proton C an atom of carbon-12 D an atom of hydrogen-1

1 marks

Answer: C

This question in 0971/12 Oct/Nov 2020

34 The element sulfur is found in a number of different minerals. Which mineral contains the greatest percentage by mass of sulfur? A barite, BaSO4 B galena, PbS C gypsum, CaSO4 D pyrite, FeS2

1 marks

Answer: D

This question in 0971/12 Oct/Nov 2020

9 What is the relative formula mass of magnesium nitrate, Mg(NO3)2? A 74 B 86 C 134 D 148

1 marks

Answer: D

This question in 0971/11 May/June 2021

9 The formula of sodium chlorate(V) is NaCl O3. What is the relative formula mass of sodium chlorate(V), NaCl O3? A 52.0 B 74.5 C 106.5 D 223.5

1 marks

Answer: C

This question in 0971/12 Oct/Nov 2021

8 The relative atomic mass, Ar, of an element is determined by comparing the mass of one atom of the element with the mass of one atom of element Q. What is Q? A carbon B chlorine C hydrogen D oxygen

1 marks

Answer: A

This question in 0971/11 May/June 2022

9 A compound of element X has the formula X2O and a relative formula mass of 144. What is element X? A copper, Cu B gadolinium, Gd C sulfur, S D tellurium, Te

1 marks

Answer: A

This question in 0971/12 May/June 2022

9 What is the relative formula mass of ammonium sulfate, (NH4)2SO4? A 63 B 114 C 118 D 132

1 marks

Answer: D

This question in 0971/12 Oct/Nov 2022

8 What is the relative formula mass of ammonium nitrate, NH4NO3? A 80 B 108 C 122 D 150

1 marks

Answer: A

This question in 0971/11 May/June 2023

8 What is the relative formula mass of Mg(OH)2? A 21 B 30 C 42 D 58

1 marks

Answer: D

This question in 0971/12 May/June 2023

9 The formula of a compound containing element X is Na2X2O3. The relative formula mass of the compound is 158. What is the relative atomic mass of X? A 32 B 59.5 C 64 D 119

1 marks

Answer: A

This question in 0971/12 Oct/Nov 2023

12 What is the definition of relative molecular mass, Mr? A It is the average mass of the isotopes in a compound. B It is the sum of the atomic numbers in a compound. C It is the sum of the relative atomic masses in a compound. D It is the total number of atoms in a compound.

1 marks

Answer: C

This question in 0971/12 May/June 2024

10 What is the relative formula mass of magnesium bromide? A 47 B 82 C 104 D 184

1 marks

Answer: D

This question in 0971/12 Oct/Nov 2024

11 What is the relative formula mass of calcium sulfate, CaSO4? A 88 B 92 C 136 D 232

1 marks

Answer: C

This question in 0971/12 Oct/Nov 2025