Lesson 5.3.1.2
5.3.1.2 Relative formula mass Quiz: AQA Combined Science, Unit 10
20 questions
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Lesson 5.3.1.2, Relative formula mass: 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 10: Quantitative chemistry, written with Revision Ninja.
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The 20 questions
-
What does the relative formula mass of a compound represent?
- Sum of atomic masses
- Ratio of elements
- Product of atomic masses
- Total number of atoms
-
In a balanced equation, how does the total reactant Mr compare to the product Mr?
- Reactants are larger
- They are equal
- They are unrelated
- Products are larger
-
What is the relative formula mass of CO2? (C = 12, O = 16)
- 32
- 28
- 58
- 44
-
What is the relative formula mass of Ca(OH)2? (Ca = 40, O = 16, H = 1)
- 74
- 57
- 56
- 58
-
What is the relative formula mass of H2SO4? (H = 1, S = 32, O = 16)
- 97
- 98
- 66
- 100
-
What is the relative formula mass of Na2CO3? (Na = 23, C = 12, O = 16)
- 84
- 106
- 110
- 94
-
What is the relative formula mass of Al2O3? (Al = 27, O = 16)
- 54
- 102
- 70
- 86
-
What is the percentage by mass of magnesium in magnesium oxide? (Mg = 24, O = 16)
- 24%
- 60%
- 76%
- 40%
-
What is the percentage by mass of iron in iron(III) oxide, Fe2O3? (Fe = 56, O = 16)
- 56%
- 30%
- 80%
- 70%
-
What is the percentage by mass of calcium in calcium carbonate, CaCO3? (Ca = 40, C = 12, O = 16)
- 48%
- 60%
- 40%
- 12%
-
A compound has the formula C2H4O2 (C = 12, H = 1, O = 16). What is the percentage by mass of oxygen?
- 40.0%
- 26.7%
- 53.3%
- 66.7%
-
What is the relative formula mass of water? (H = 1, O = 16)
- 17
- 16
- 18
- 20
-
What is the sum of the Mr values of the reactants in Mg + 2HCl -> MgCl2 + H2? (Mg = 24, HCl = 36.5)
- 61
- 85
- 95
- 97
-
What is the relative formula mass of ZnSO4? (Zn = 65, S = 32, O = 16)
- 97
- 193
- 129
- 161
-
What is the relative formula mass of Fe(OH)3? (Fe = 56, O = 16, H = 1)
- 107
- 110
- 101
- 104
-
How many grams of magnesium are contained in 8 g of magnesium oxide? (Mg = 24, O = 16)
- 8.0 g
- 4.8 g
- 3.2 g
- 2.4 g
-
In the reaction N2 + 3H2 -> 2NH3, what is the total Mr of the reactants as shown in the equation? (N = 14, H = 1)
- 34
- 17
- 28
- 40
-
What is the percentage by mass of nitrogen in ammonia, NH3? (N = 14, H = 1)
- 82.4%
- 50.0%
- 17.6%
- 14.0%
-
Which quantity is calculated from the relative atomic masses of the atoms in a formula?
- Mass number
- Relative formula mass
- Atomic number
- Empirical charge
-
What is the relative formula mass of Na2SO4? (Na = 23, S = 32, O = 16)
- 142
- 150
- 126
- 118
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