Al2(CO3)3 + 2 H3PO4 = 2 AlPO4 + 3 CO2 + 3 H2O

Insert the correct number of atoms from each element from the reactant side of the equation
Al_
C_
O_
H_
P_

Al = 2

C = 3
O = 9
H = 6
P = 2

To determine the number of atoms for each element from the reactant side of the equation, let's break down the chemical formula for each compound.

1. Al2(CO3)3:
- There are 2 atoms of aluminum (Al).
- There are 3 carbonate ions (CO3), and each carbonate ion contains 1 atom of carbon (C) and 3 atoms of oxygen (O). So in total, there are 3 carbon atoms and 9 oxygen atoms.

2. H3PO4:
- There are 3 atoms of hydrogen (H).
- There is 1 atom of phosphorus (P) and 4 atoms of oxygen (O).

Now, let's list the number of atoms of each element from the reactant side of the equation:

Al: 2
C: 3
O: 17
H: 9
P: 1

Al: 2

C: 3
O: 9
H: 6
P: 2