According to the law of conservation of mass, what should the product side of this single replacement reaction look like?

Zn+2HCI------>

A. H2 ZnCl2
B. H2 + Zn + Cl2
C. H2 + ZnCl2
D. ZnCl2

Could anyone explain it to me???
Thank you

4 answers

Zn -> Zn++, replaces 2H+ in HCl, 2H+ ->H2
so
H2 + Zn Cl2
A is correct.
Zn + 2HCl ==> ZnCl2 + H2. The mass balances. On the left you have
65.4 +2*H + 2*35.5 = 138.4. On the right you have
65.4 + 2*35.5 + 2*1 = 138.4
Okay thank you!!!
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