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

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!

Ais the correct answer

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.