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A compound has the formula X3Y.For every 15 X atoms present in this compound, how many Y atoms are there?

Question

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Solution

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.

To solve for Y, cross multiply and divide:

Y = (1 * 15) / 3 = 5.

So, for every 15 atoms of X, there are 5 atoms of Y.

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