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13 July, 11:43

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

A) 2Al + 6HCl yields 2AlCl3 + 3H2

B) Na2C2O4 + Pb (NO3) 2 yields PbC2O4 + 2NaNO3

C) AgNO3 + LiCl yields AgCl + LiNO3

D) 3Ca + 2Cr (NO3) 3 yields 3Ca (NO3) 3 + 2Cr

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  1. 13 July, 13:48
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    D is the answer.

    On the left, there are 3 atoms of Ca, 2 atoms of Cr, 6 atoms of N, and 18 atoms of O.

    On the right, there are 3 atoms of Ca, 9 atoms of N, 27 atoms of O, and 2 atoms of Cr.
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