Each molecule of iron oxide, fe2o3, contains atom(s) of iron.
a. one
c. three
b. two
d. five

b. two

Explanation:

In a chemical compound formula, we know the number of atoms that each element has for the subindices that accompanies it, if it does not have any number, it means that it is 1

For example one molecule of contains two atoms and hydrogen and one of oxygen

An molecule contains, 2 iron atoms and 3 oxygen atoms

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i just learnt this recently but i need to look through my notes again