Question

question 5 ba3(po4)2 # of molecules is # of elements is there are barium atoms there are phosphorus atoms there are oxygen atoms

Explanation:

Step1: Determine number of molecules

The formula represents 1 molecule of $Ba_3(PO_4)_2$.
1

Step2: Identify elements

The elements are Ba (barium), P (phosphorus), and O (oxygen), so 3 elements.
3

Step3: Count barium atoms

The sub - script of Ba is 3, so 3 barium atoms.
3

Step4: Count phosphorus atoms

The sub - script of P inside the parentheses is 1 and there are 2 phosphate groups, so $1\times2 = 2$ phosphorus atoms.
2

Step5: Count oxygen atoms

The sub - script of O inside the parentheses is 4 and there are 2 phosphate groups, so $4\times2=8$ oxygen atoms.
8

Answer:

of molecules is 1

of elements is 3

There are 3 Barium atoms
There are 2 Phosphorus atoms
There are 8 Oxygen atoms