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A sample of chlorine is modelled as containing only the two isotopes shown in Figure 1. Use the mass numbers as the isotope masses when calculating the relative atomic mass.
State the number of neutrons in
State where the electrons are found relative to the nucleus in a chlorine atom.
Explain why and are isotopes.
Using Figure 1, determine the relative atomic mass of the chlorine sample. Give your answer to 3 significant figures.
A sample contains of molecules. What is the number of oxygen atoms in the sample? Use
Answer: C. Each molecule contains two oxygen atoms. Thus, oxygen atoms.
A: uses and counts molecules rather than oxygen atoms.
B: counts molecules but omits the two oxygen atoms in each molecule.
D: shifts the amount one place too high, using
Remember: multiply by the number of specified entities in each molecule when counting atoms.
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