If 200.0 g of copper(ii) sulfate react with an excess of zinc metal, what is the theoretical yield of copper? 1.253 g 50.72 g 79.63 g 194.3 g

1)we need a balanced equation: CuSO₄ + Zn ---> ZnSO₄ + Cu

2) we need to convert the grams of CuSO₄ to moles using the molar mass. 

molar mass CuSO₄= 63.5 + 32.0 + (4 x 16.0)= 160 g/mol



3) convert moles of CuSO₄ to moles of Cu



4) convert moles of Cu to grams using it's molar mass.

molar mass Cu= 63.5 g/mol



I did it step-by-step as the explanation but you can do all of this in one step. 

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.

Sorry i dont understand the question can you rephase it?