Since there are only 12 cherries for decorating the cup cakes and each cupcake has 3 cherries. Therefore, 12 divided by 3 equals 4, this means that only four cupcakes can be decorated out of the five cupcakes.
Mathematically, = 4
Hence, we can conclude that the theoretical yield is four decorated cups.
In (NH4)2C2O4 there are four moles of Hydrogen in the compound (NH4), but there two molecules of (NH4) in this compound. That's what the 2 in (NH4)2 means, so multiply 4 x 2 = 8.