Question

Calculate the amount of the 2.0 M solution of Grignard reagent ( phenylmagnesium chloride) required to give 1.5 equivalent excess relative to benzophenone Benzophenone 182.21 molecular weight, amount needed 105 mg, mmol 0.58,

Answer 1

MW Equivalent Wt to be taken mmoles

Benzophenone 182.21 1 105 mg 0.58

Phenylmagnesium 136.86 1.5 119 mg 0.87
chloride

Phenylmagnesium chloride is 2 M,

So, 2 moles of Phenylmagnesium chloride in 1 L of solution

2 (136.86) g of Phenylmagnesium chloride in 1 L of solution

273.72 g of Phenylmagnesium chloride in 1 L of solution

1 g of Phenylmagnesium chloride in (1 / 273.72) L of solution

1000 mg of Phenylmagnesium chloride in 0.00365 L of solution

1000 mg of Phenylmagnesium chloride in 3.65 mL of solution

119 mg of Phenylmagnesium chloride in (3.65 x 119) / 1000 mL of solution

119 mg of Phenylmagnesium chloride in 0.434 mL of solution

So, 0.434 mL of 2 M solution of Grignard reagent ( phenylmagnesium chloride) is required.