Answer:
Step-by-step explanation:
4CO2 - 4 molecules of CO2, 1 atom of carbon, 2 atoms of oxygen
H2O - 1 molecule of H2O, 2 atoms of hydrogen, 1 atom of oxygen
5NaCl - 5 molecules of NaCl, 1 atom of sodium, 1 atom of chloride
3ZnC2 - 3 molecules of ZnC2, 1 atom of zinc, 2 atoms of carbon