1. GCSE level Exam practise questions on calculating relative atomic mass
(Ar)
Chlorine consists of 75% chlorine-35 and 25% chlorine-37. Calculate the Ar of chlorine to 3sf/1dp. [ram-1]
35.5
35.0
36.0
35.6
Bromine consists of the isotopes: 50.5% Br-79 and 49.5% Br-81. Calculate the relative atomic mass, Ar, of bromine to 3sf/1dp. [ram-2]
80.1
80.0
79.9
79.8
Lithium consists of 7.4% lithium-6 and 92.6% lithium-7. Calculate the relative atomic mass, Ar, of lithium to 2sf/1dp. [ram-3]
6.5
6.7
6.9
6.6
Boron is 19.7% B-10 and 80.3% B-11. Calculate the relative atomic mass, Ar, of boron to 3sf/1dp. [ram-4]
10.5
10.9
10.3
10.8
Antimony (Sb) is 57.2% Sb-121 and 42.8% Sb-123. Calculate the Ar of Sb to 4sf/1dp. [ram-5]
121.9
122.0
122.1
121.2
Chromium has four stable isotopes. 4.31% Cr-50, 83.76% Cr-52, 9.55% Cr-53 and 2.38% Cr-54. Calculate the relative atomic mass, Ar, of chromium to 3sf/1dp. [ram-6]
52.3
52.1
52.2
52.5
Copper consists of 69.1% Cu-63 and 30.9% Cu-65. Calculate the relative atomic mass, Ar, of copper to 3sf/1dp. [ram-7]
64.0
63.3
63.6
64.5
Europium consists of 47.8% Eu-151 and 52.2% Eu-153. Calculate Ar(Eu) to 4sf/1dp. [ram-8]
151.9
152.2
151.5
152.0
Gallium is made up of 60.2% gallium-69 and 39.8% of gallium-71. Calculate the Ar of gallium to 3sf/1dp. [ram-9]
69.8
70.0
69.9
69.5
Iron has four stable isotopes. 5.8% Fe-54, 91.7% Fe-56, 2.2% Fe-57 and 0.3% Fe-58. Calculate the Ar of iron to 3sf/1dp. [ram-10]
56.2
55.9
56.3
56.1
Magnesium consists of 78.6% 24Mg, 10.1% 25Mg and 11.3% of 26Mg. Calculate the relative atomic mass, Ar, of magnesium to 3sf/1dp. [ram-11]
25.0
24.7
24.3
24.1
Neon consists of 90.9% 20Ne, 0.3% 21Ne and 8.8% 22Ne. Calculate the relative atomic mass, Ar, of neon to 3sf/1dp. [ram-12]
20.5
20.1
20.3
20.2
Rhenium (Re) consists of 37.1% 185Re and 62.9% 187Re. Calculate the relative atomic mass, Ar, of rhenium to 4sf/1dp. [ram-13]
186.3
186.0
185.6
185.5
Rubidium consists of the stable isotopes: 85Rb (72.2%) and 87Rb (27.8%). Calculate Ar(Rb) to 3sf/1dp. [ram-14]
86.0
85.6
85.9
85.5
Thallium consists of 29.5% thallium-203 and 70.5% thallium-205. Calculate the relative atomic mass, Ar, of to 4sf/1dp. [ram-15]
204.0
204.2
204.4
204.1
Chlorine consists of 75% chlorine-35 and 25% chlorine-37. Calculate the Ar of chlorine to 3sf/1dp. [ram-1]
Bromine consists of the isotopes: 50.5% Br-79 and 49.5% Br-81. Calculate the relative atomic mass, Ar, of bromine to 3sf/1dp. [ram-2]
Lithium consists of 7.4% lithium-6 and 92.6% lithium-7. Calculate the relative atomic mass, Ar, of lithium to 2sf/1dp. [ram-3]
Boron is 19.7% B-10 and 80.3% B-11. Calculate the relative atomic mass, Ar, of boron to 3sf/1dp. [ram-4]
Antimony (Sb) is 57.2% Sb-121 and 42.8% Sb-123. Calculate the Ar of Sb to 4sf/1dp. [ram-5]
Chromium has four stable isotopes. 4.31% Cr-50, 83.76% Cr-52, 9.55% Cr-53 and 2.38% Cr-54. Calculate the relative atomic mass, Ar, of chromium to 3sf/1dp. [ram-6]
Copper consists of 69.1% Cu-63 and 30.9% Cu-65. Calculate the relative atomic mass, Ar, of copper to 3sf/1dp. [ram-7]
Europium consists of 47.8% Eu-151 and 52.2% Eu-153. Calculate Ar(Eu) to 4sf/1dp. [ram-8]
Gallium is made up of 60.2% gallium-69 and 39.8% of gallium-71. Calculate the Ar of gallium to 3sf/1dp. [ram-9]
Iron has four stable isotopes. 5.8% Fe-54, 91.7% Fe-56, 2.2% Fe-57 and 0.3% Fe-58. Calculate the Ar of iron to 3sf/1dp. [ram-10]
Magnesium consists of 78.6% 24Mg, 10.1% 25Mg and 11.3% of 26Mg. Calculate the relative atomic mass, Ar, of magnesium to 3sf/1dp. [ram-11]
Neon consists of 90.9% 20Ne, 0.3% 21Ne and 8.8% 22Ne. Calculate the relative atomic mass, Ar, of neon to 3sf/1dp. [ram-12]
Rhenium (Re) consists of 37.1% 185Re and 62.9% 187Re. Calculate the relative atomic mass, Ar, of rhenium to 4sf/1dp. [ram-13]
Rubidium consists of the stable isotopes: 85Rb (72.2%) and 87Rb (27.8%). Calculate Ar(Rb) to 3sf/1dp. [ram-14]
Thallium consists of 29.5% thallium-203 and 70.5% thallium-205. Calculate the relative atomic mass, Ar, of to 4sf/1dp. [ram-15]
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Chlorine consists of 75% chlorine-35 and 25% chlorine-37. Calculate the Ar of chlorine to 3sf/1dp. [ram-1]