A compound has the formula X3Y.For every 15 X atoms present in this compound, how many Y atoms are there?
Question
Solution 1
The formula X3Y means that for every 3 atoms of X, there is 1 atom of Y.
If there are 15 atoms of X, we can find out how many Y atoms there are by setting up a proportion:
3 atoms of X is to 1 atom of Y as 15 atoms of X is to how many atoms of Y.
So, 3/1 = 15/Y.
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