Relative Atomic Mass Questions
Make a sketch, only roughly to scale, of the mass spectrum of mercury, using the following
information:, then calculate its relative atomic mass.
Mass no.
196
198
199
200
201
202
204
of isotope
Abundance 0.146
10.02
16.84
23.13
13.22
29.80
6.85
(%)
1.
2.
3.
4.
5.
6.
Magnesium has three isotopes, Mg-24, Mg-25 and Mg-26. The percentage of each, in order, is
78.70%, 10.13% and 11.17%. Calculate the relative atomic mass of magnesium
Calculate the percentage composition of boron given that the relative atomic mass of boron is
10.8 and the mass numbers of the two isotopes are 10 and 11.
Sulfur has a relative atomic mass of 32.07 and consists of isotopes with mass numbers 32 and
24. Calculate a percentage composition of each isotope in the element.
Gallium has a relative atomic mass of 69.72. One of the isotopes has a relative abundance of
64% and a relative isotopic mass of 69.0. What is the mass number of the other isotope?
The relative isotopic mass of lithium is 6.94. Two isotopic forms exist. These have relative
isotopic masses of 6.01 and 7.02. What is the percentage of each?
Relative Atomic Mass Questions
1. Make a sketch, only roughly to scale, of the mass spectrum of mercury, using the following
information:, then calculate its relative atomic mass.
Mass no.
196
198
199
200
201
202
204
of isotope
Abundance 0.146
10.02
16.84
23.13
13.22
29.80
6.85
(%)
2. Magnesium has three isotopes, Mg-24, Mg-25 and Mg-26. The percentage of each, in order, is
78.70%, 10.13% and 11.17%. Calculate the relative atomic mass of magnesium
3. Calculate the percentage composition of boron given that the relative atomic mass of boron is 10.8
and the mass numbers of the two isotopes are 10 and 11.
4. Sulfur has a relative atomic mass of 32.07 and consists of isotopes with mass numbers 32 and 24.
Calculate a percentage composition of each isotope in the element.
5. Gallium has a relative atomic mass of 69.72. One of the isotopes has a relative abundance of 64%
and a relative isotopic mass of 69.0. What is the mass number of the other isotope?
6. The relative isotopic mass of lithium is 6.94. Two isotopic forms exist. These have relative
isotopic masses of 6.01 and 7.02. What is the percentage of each?
Relative Atomic Mass Questions
1. Make a sketch, only roughly to scale, of the mass spectrum of mercury, using the following
information:, then calculate its relative atomic mass.
Mass no.
196
198
199
200
201
202
204
of isotope
Abundance 0.146
10.02
16.84
23.13
13.22
29.80
6.85
(%)
2. Magnesium has three isotopes, Mg-24, Mg-25 and Mg-26. The percentage of each, in order, is
78.70%, 10.13% and 11.17%. Calculate the relative atomic mass of magnesium
3. Calculate the percentage composition of boron given that the relative atomic mass of boron is 10.8
and the mass numbers of the two isotopes are 10 and 11.
4. Sulfur has a relative atomic mass of 32.07 and consists of isotopes with mass numbers 32 and 24.
Calculate a percentage composition of each isotope in the element.
5. Gallium has a relative atomic mass of 69.72. One of the isotopes has a relative abundance of 64%
and a relative isotopic mass of 69.0. What is the mass number of the other isotope?
6. The relative isotopic mass of lithium is 6.94. Two isotopic forms exist. These have relative
isotopic masses of 6.01 and 7.02. What is the percentage of each?