If you want to make 2 moles of Silver from the reaction below, how many grams of copper should you start with?

Reaction: Cu + 2AgNO3 → 2Ag + Cu(NO3)2

The gas would begin to expand, and eventually the can would burst or explode.

about what?
have a good day

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).