1. When 1.00 g of the limiting reagent cyclohexanol (FW -100 g/mol) is converted
ID: 592140 • Letter: 1
Question
1. When 1.00 g of the limiting reagent cyclohexanol (FW -100 g/mol) is converted to give 0.710 g of purified cyclohexyl acetate (FW = 142 g/mol), the percent yield is: OH H catalyst cyclohexanol cyclohexyl acetate a. 71.0% b. 70.4% c. 50.0% d. 29.0% 2. Which physical property would be affected most by changes in the atmospheric pressure? a. melting point b. boiling point c. refractive index d. molecular weight 3. Solubility data was collected for benzophenone. Which solvent or solvent pair would be the best choice to recrystallize benzophenone? Acetone Ethanol Water Compound coldhot cold hot cold hot PS Benzophenone (S-soluble, I- insoluble, PS-partially soluble) a. acetone b. ethanol c. water d. hot acetone:hot ethanol solvent pair 4. When CH Cl2 and an aqueous solution are mixed, a. CHyClh will react with the water in the aqueous solution forming an alcohol. b. CH2Cl2 will mix completely with the aqueous solution and one layer will be present c. CH2Cl2 will not mix with the aqueous solution and CH,Ch will be found as the upper liquid layer. d. CH2Cl2 will not mix with the aqueous solution and CH,Cl2 will be found as the lower liquid layer.Explanation / Answer
Ans 1 : c) 50.0 %
Number of moles of cyclohexanol = 1.00 / 100 = 0.01 moles
So theoretical yield of cyclohexyl acetate = 0.01 moles or 0.01 x 142 = 1.42 grams
Percent yield = ( actual yield / theoretical yield) x 100
= ( 0.710 / 1.42) x 100
= 50.0 %
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