Calculating the theoretical yield of the final product (Triphenylcarbinol). You will need to calc the L.R. first, using 2g Mg and then 9g Bromobenzene (g-->moles--> moles Phenylmagnesium bromide). Using the L.R. determined, calculate the grams triphenylcarbinol that can be obtained (there is a 2:1 ratio of phenylmagnesium bromide to methylbenzoate).