Which of the following equations violates the law of conservation of mass? A. FeCl3 + 3NaOH → Fe(OH)3 + 3NaCl B. CS2 + 3O2 → CO2 + 2SO2 C. Mg(ClO3)2 → MgCl2 + 2O2 D. Zn + H2SO4 → H2 + ZnSO4

To determine which of the following equations violates the law of conservation of mass, we need to check if the number of atoms of each element is the same on both the reactant side (left side) and the product side (right side) of the equation. The law of conservation of mass states that mass cannot be created or destroyed in a chemical reaction.

Let's investigate each option:

A. FeCl3 + 3NaOH → Fe(OH)3 + 3NaCl When we balance this equation: - Fe: 1 atom on both sides - Cl: 3 atoms on both sides - Na: 3 atoms on both sides - O: 3 atoms on both sides (as part of NaOH and Fe(OH)3) - H: 3 atoms on both sides (as part of NaOH and Fe(OH)3) This equation follows the law of conservation of mass.

B. CS2 + 3O2 → CO2 + 2SO2 When we balance this equation: - C: 1 atom on both sides - S: 2 atoms on both sides - O: 6 atoms on both sides (3 O2 molecules on reactant side, 1 CO2 and 2 SO2 molecules on product side) This equation follows the law of conservation of mass.

C. Mg(ClO3)2 → MgCl2 + 2O2 When we balance this equation: - Mg: 1 atom on both sides - Cl: 2 atoms on the reactant side, but only 1 atom on the product side - O: 6 atoms on the reactant side, but 4 atoms as O2 on the product side along with 2 more in MgCl2 There is a discrepancy in the number of chlorine and oxygen atoms. This equation violates the law of conservation of mass because it is not balanced.

D. Zn + H2SO4 → H2 + ZnSO4 When we balance this equation: - Zn: 1 atom on both sides - H: 2 atoms on both sides - S: 1 atom on both sides - O: 4 atoms on both sides This equation follows the law of conservation of mass.

Therefore, the equation which violates the law of conservation of mass is C. Mg(ClO3)2 → MgCl2 + 2O2 because it does not have the same amount of each type of atom on both sides of the equation.