Zn + Cl2 → ZnCl2 - 3, 2Na3PO4 + 3MgCl2 → 6NaCl + Mg3(PO4)2 - 25, 2Na + 2H2O → 2NaOH + H2 - 8, 2HgO → 2Hg + O2 - 4, Zn + 2HCl → ZnCl2 + H2 - 5, 2H2 + O2 → 2H2O - 6, S8 + 12O2 → 8SO3 - 32, 2NaOH + H2SO4 → Na2SO4 + 2H2O - 13, C3H8 + 5O2 → 3CO2 + 4H2O - 21, 6CO2 + 6H2O → C6H12O6 + 6O2 - 36,

Conservation of Mass

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