Which of the following equations violates the law of conservation of mass? (2 points) Question 6 options: 1) 2Al + 6HCl yields 2AlCl3 + 3H2 2) Na2C2O4 + Pb(NO3)2 yields PbC2O4 + 2NaNO3 3) AgNO3 + LiCl yields AgCl + LiNO3 4) 3Ca + 2Cr(NO3)3