$($b$)$ Suppose a student desires to obtain $3\mathrm{.}0g$ of a solid. The scale reads $3\mathrm{.}026g.$ subtract or do nothing to match scale reading with the desired weight?

Explain.

Determine the theoretical yield of the alum. Use the aluminum foil as the limiting reagent and presume that the foil was pure aluminum.

Calculate the percent yield of your alum crystals.

Discuss the factors that affected the percent yield.