Question

1. (15 points) A student in an organic ch points) A student in an organic chemistry lab prepared dibenzalacetone according to the following chemical res following chemical reaction using excess base. It is important that the molar ratio of the reactants in this reaction be 2:1. NaOll heat (-2 ,0) 234.30 g/mol 58.08 g/mol 106.23 g/mol a) If the student started with 1.06 g of benzaldehyde and 0.29 g of acetone, what is the theoretical yield of the product? b) If 1.05 g of the yellow product is obtained, calculate the percent yield. c) What would be the expected product for a 1:1 mole ratio of the reactants? d) Another student carries out this reaction using 16 moles of benzaldehyde and 10 moles of acetone and obtains 6 moles of dibenzalacetone. i) What is the limiting reactant? ii) What is the excess reactant and how many moles of this reactant will be left at the end of the reaction? iii) What is the percent yield of this reaction? iv) What is the actual grams of the yellow product obtained in this reaction?

Answer 1

a 214.30 g/mol ut: 1.06g. 0.299 per - HW: 106.23 58.08 e mole: 0.0090 0.0049. 2 Here limiting reagent is 1. Theritical field of produch= acetone. limiting reagent cot poducho limiting regenthaw How 0:29 58108 x 214-30g/mol The critical yield = 1.069 g. obtained fo product is = 205g yield a he obtained produchsia Thoritical yied = 1105 X 100 - 98.22% 10069 x 1- for a moles of Benzaldehegte: 1.06 I moles of Benzaltingde = 0.539 2 moles of Benzaldehy seation with one mok of acetone. I moles of orbenzaldehy reaction with 0.5 mole of acetone (cs CamScanne

2 To6.23x2 Then one mole of acetone = 0.299 0.2 0.0049 mole ome mole of Benzaldehyde - 0.939:0053 - 0.00249 me Heare limiting reagent is Benzaldehyde: 121 oration poroder yied: 0.00249 x 214.30 = 0.5345 g. mole = 16 10 6 moles. (y) Limiting reagent is Benzaldehyde. because one mole of acetone requished 2 mokes of Benzaldehyd. so Lowest moles is 1-8 Bengaldehyde. 1) Benzaldehyde wt = 16 x 106.23 omamok : un : 1699.689 Acelone wt= 10x58-08: 580.89 van dequied lot of Acebmes 8x58-08 - 464.64 Excess reachen weigh = 580.8 - Lou-bu = 216.16g iv) The olitical yield = 1687.68 x 214.30 = 1114.48 2x106-23 Expenmimetal yield = 6x214-30 = 1285.8. % yield = 12858 x 100 = 75% as canThe actual goons of yellow poodut : 1285-89 CamScanner