Hydrogen has three isotopes with mass numbers 1, 2 and 3.
What is the total number of possible relative molecular masses that hydrogen gas can have?
A) 3
B) 4
C) 5
D) 6
Answer: C
- Hydrogen gas is a diatomic molecule i.e. H2
- Since there are 3 types of H atoms, the molecule can be made up of the following combination of atoms:
1H – 1H
1H – 2H
1H – 3H
2H – 2H
2H – 3H
3H – 3H
- Relative molecular mass (Mr) can be obtained by summing the mass number of the atoms in the molecule.
- From the combinations above, there will be 5 different Mr: 2,3,4,5,6
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