Consider the two reactions A and B. What mass of zinc carbonate will form if you react 1.50 g zinc with 1.50 g sulfur dioxide and reaction A proceeds with 75.5% yield and reaction B with a 85.0% yield.Zn(s)+2SO2

Hint: Matter cannot be created nor destroyed. :)

You are looking for Zinc carbonate while there is no carbon atom to start with.