Relative Atomic Mass Questions

1. An element has two isotopes with mass numbers 202 and 204. The percentage abundance of
the first isotope is 28%, and the second isotope is 72%. Calculate the relative atomic mass of the
element.

2. An element has two isotopes with mass numbers 191 and 192. The percentage abundance of
the first isotope is 22%, and the second isotope is 78%. Calculate the relative atomic mass of the
element.

3. An element has two isotopes with mass numbers 242 and 246. The percentage abundance of
the first isotope is 76%, and the second isotope is 24%. Calculate the relative atomic mass of the
element.

4. An element has two isotopes with mass numbers 38 and 43. The percentage abundance of the
first isotope is 5%, and the second isotope is 95%. Calculate the relative atomic mass of the
element.

5. An element has two isotopes with mass numbers 144 and 148. The percentage abundance of
the first isotope is 83%, and the second isotope is 17%. Calculate the relative atomic mass of the
element.

6. An element has two isotopes with mass numbers 88 and 90. The percentage abundance of the
first isotope is 53%, and the second isotope is 47%. Calculate the relative atomic mass of the
element.

7. An element has two isotopes with mass numbers 101 and 105. The percentage abundance of
the first isotope is 35%, and the second isotope is 65%. Calculate the relative atomic mass of the
element.

8. An element has two isotopes with mass numbers 73 and 76. The percentage abundance of the
first isotope is 98%, and the second isotope is 2%. Calculate the relative atomic mass of the
element.

9. An element has two isotopes with mass numbers 157 and 162. The percentage abundance of
the first isotope is 82%, and the second isotope is 18%. Calculate the relative atomic mass of the
element.

10. An element has two isotopes with mass numbers 154 and 159. The percentage abundance of
the first isotope is 48%, and the second isotope is 52%. Calculate the relative atomic mass of the
element.

11. An element has two isotopes with mass numbers 75 and 76. The percentage abundance of the
first isotope is 97%, and the second isotope is 3%. Calculate the relative atomic mass of the
element.

12. An element has two isotopes with mass numbers 204 and 207. The percentage abundance of
the first isotope is 30%, and the second isotope is 70%. Calculate the relative atomic mass of the
element.

13. An element has two isotopes with mass numbers 71 and 72. The percentage abundance of the
first isotope is 74%, and the second isotope is 26%. Calculate the relative atomic mass of the
element.

14. An element has two isotopes with mass numbers 211 and 213. The percentage abundance of
the first isotope is 80%, and the second isotope is 20%. Calculate the relative atomic mass of the
element.

15. An element has two isotopes with mass numbers 248 and 250. The percentage abundance of
the first isotope is 38%, and the second isotope is 62%. Calculate the relative atomic mass of the
element.

16. An element has two isotopes with mass numbers 18 and 23. The percentage abundance of the
first isotope is 79%, and the second isotope is 21%. Calculate the relative atomic mass of the
element.

17. An element has two isotopes with mass numbers 70 and 75. The percentage abundance of the
first isotope is 97%, and the second isotope is 3%. Calculate the relative atomic mass of the
element.

18. An element has two isotopes with mass numbers 223 and 228. The percentage abundance of
the first isotope is 97%, and the second isotope is 3%. Calculate the relative atomic mass of the
element.

19. An element has two isotopes with mass numbers 152 and 157. The percentage abundance of
the first isotope is 92%, and the second isotope is 8%. Calculate the relative atomic mass of the
element.

20. An element has two isotopes with mass numbers 110 and 115. The percentage abundance of
the first isotope is 73%, and the second isotope is 27%. Calculate the relative atomic mass of the
element.

21. An element has two isotopes with mass numbers 48 and 53. The percentage abundance of the
first isotope is 59%, and the second isotope is 41%. Calculate the relative atomic mass of the
element.

22. An element has two isotopes with mass numbers 130 and 131. The percentage abundance of
the first isotope is 93%, and the second isotope is 7%. Calculate the relative atomic mass of the
element.

23. An element has two isotopes with mass numbers 168 and 171. The percentage abundance of
the first isotope is 78%, and the second isotope is 22%. Calculate the relative atomic mass of the
element.

24. An element has two isotopes with mass numbers 224 and 228. The percentage abundance of
the first isotope is 37%, and the second isotope is 63%. Calculate the relative atomic mass of the
element.

25. An element has two isotopes with mass numbers 164 and 165. The percentage abundance of
the first isotope is 47%, and the second isotope is 53%. Calculate the relative atomic mass of the
element.

26. An element has two isotopes with mass numbers 105 and 109. The percentage abundance of
the first isotope is 49%, and the second isotope is 51%. Calculate the relative atomic mass of the
element.

27. An element has two isotopes with mass numbers 145 and 146. The percentage abundance of
the first isotope is 40%, and the second isotope is 60%. Calculate the relative atomic mass of the
element.

28. An element has two isotopes with mass numbers 136 and 137. The percentage abundance of
the first isotope is 32%, and the second isotope is 68%. Calculate the relative atomic mass of the
element.

29. An element has two isotopes with mass numbers 225 and 230. The percentage abundance of
the first isotope is 70%, and the second isotope is 30%. Calculate the relative atomic mass of the
element.

30. An element has two isotopes with mass numbers 50 and 51. The percentage abundance of the
first isotope is 85%, and the second isotope is 15%. Calculate the relative atomic mass of the
element.