REDUCTION OF BENZIL USING SODIUM BOROHYDRIDE: (95% ethanol was used in this process)

Based on the masses and data provided in the picture calculate and explain:

-the limiting reagent

-the theoretical yield

-the percent yield

*please be sure to explain where the numbers are coming from- as I am a little confused as to how to find the limiting reagent and theoretical yield*

Additional information such as chemical equation is provided in subsequent picture.

 

masses 125-ml Erlenmeyer flask = 83,659 watch glass - 63.821g Benzil = 0.9749 NaBH4 = 0.2129 mass of product + watch glass after drying = 64.485g melting point of product = 135-139C. melting point of product + benzuin (mixecl mp) = 133-135C melting point of product + meso-hydrobenzoin = 136-138 C major product = meso-hydro benzoin calculate: - limiting reagent theoretical yield percent yield