Calculation Quiz 1. Calculating relative atomic mass

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

chemical calculations practice exam questions KS4 science GCSE/IGCSE chemistry courses AQA Edexcel OCR 21st Century OCR Gateway sciences for high schools secondary schools colleges private tuition revision courses K12 science

Calculation Quiz 1. Calculating relative atomic mass

CLICK [?] and read any feedback (may need to scroll down). All GCSE Chemistry, Earth Science and Radioactivity Quizzes "Doc Brown's Chemistry Clinic" EMAIL query?comment, quote Q ref [ram-xx]) (01-06-09)