Answer:
10.78moles
Step-by-step explanation:
Avogadro's hypothesis gives us a background understanding that 1mole of any substance contains 6.02x10^23 atoms.
Now, If 1 mole of K3PO4 contains 6.02x10^23 atoms,
Then Xmol of K3PO4 will contain = 6.49x10^24 atoms i.e
Xmol of K3PO4 = 6.49x10^24/6.02x10^23 = 10.78moles
