Answer:
in chemical reactions moles correspond to the number of molecules or atoms that go into reaction. It means that number that is in front of molecule or atom for example in this reaction you have one oxygen it means one mole of oxygen. 4 molecules of acid correspond to 4 moles of HCl. So the final answer would be:
4 moles of HCl
2 moles of H2O
2 moles of Cl2