Conservation in Chemical Reactions Quick Check

Question

1.) Zn + 2HCl → H2 + ZnCl2
2.) The total number of atoms does not change, so mass is conserved in the reaction.
3.) 215 amu
4.) 76 amu

Answer 1

1 and 2 are OK. I don't know what 3 and 4 are all about.

Answer 2

Thank you

Answer 3

thank you so much