Question

How many atoms of phosphorus are represented in 2Ca3(PO4)2? 2 4 8 16

Answer 1

We will have *1 2of2 atoms =p

Answer 2

Hello !



The number to the right of each element represents the number of the atoms of that element.


PO4 is taken twice so you will multiply 1 and 4 by 2.

Now we have 1*2=2 atoms of P



To the left,there is 2,so you will multiply all the elements by 2.It means that you'll multiply 2 (atoms of P) by 2 :


   2*2=4 atoms of phosphorus


ANSWER : 4