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13 May, 16:29

Which of the following equations violates the law of conservation of mass?

A. FeCl3 + 3NaOH yields Fe (OH) 3 + 3NaCl

B. CS2 + 3O2 yields CO2 + 2SO2

C. Mg (ClO3) 2 yields MgCl2 + 2O2

D. Zn + H2SO4 yields H2 + ZnSO4

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Answers (1)
  1. 13 May, 17:53
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    Hi!

    The chemical equation that violates the law of conservation of mass is C

    Mg (ClO₃) ₂ → MgCl₂ + 2O₂

    Let's see why:

    The number of atoms from each element should be the same on both sides of the equation.

    For Mg:1 atoms Left Side=1 atoms Right Side

    For Cl:2 atoms Left Side=2 atoms Right Side

    For O: 6 atoms Left Side ≠ 4 atoms Right Side

    So, the equation is not balanced for O. The correct balanced equation is the following:

    Mg (ClO₃) ₂ → MgCl₂ + 3O₂

    Have a nice day!
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