yujiqt yujiqt 19-09-2022 Chemistry Answered a. Write chemical formula of copper (I) oxide, iron (III) carbonate, and magnesium sulfate b. Calculate the proportion by mass of the elements in each compound. (Given: M(Cu) = 64 M(Fe) = 56 M(S) = 32 M(Mg) = 24 M(O) =16 M(C) = 12)