Question

. Which chemical equation best illustrates the Law of Conservation of Mass?

2H2O = H2 + O2

CH4 + 3O2 = CO2 + 2H2O

Al4C3 + 3H2O = CH4 + 4Al(OH)3

Zn + 2HCl = ZnCl2 + H2

Could you help explain?

Answer 1

Which one hás the same number of each element on each side?

Answer 2

For example, the first reaction has 4 Hydrogen atoms and 2 Oxygen atoms as reactants, but 2 Hydrogens and 2 Oxygens as products. Since the numbers are not the same, the mass is not conserved.

Answer 3

So all you have to do is see if the amount of the element is the same on each side?

Answer 4

Yup