How many sodium atoms are represented in the formula $7Na_3PO_4$ ?

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Answer 1 · 2016-11-28T17:45:23

What is $7xx3?$

In one formula unit of $Na_3PO_4$ , clearly there are 3 sodium atoms, 1 phosphorus atom, and 4 oxygen atoms. Do you agree?

So if we have seven formula units of $Na_3PO_4$ , there are $7xx3$ sodium atoms, $7xx1$ phosphorus atoms, and $7xx4$ oxygen atoms.

How many sodium atoms are represented in the formula 7Na_3PO_47Na_3PO_4?