Edexcel Jan 2017 (IAL) Paper 3 Q5

Answers available below

In an experiment to prepare cyclohexene, C6H10, concentrated sulfuric acid, H2SO4, was added slowly to 6.24 g of cyclohexanol, C6H11OH, in the apparatus shown in the diagram. The mixture was heated. concentrated sulfuric acid cyclohexanol heat cyclohexene As the reaction took place, an impure liquid distilled over into the collection flask. The equation for the preparation of cyclohexene is C6H11OHC6H10 + H2O (a) (i) Calculate the volume of cyclohexanol used in this experiment. The density of cyclohexanol is 0.962 g cm3. (2) *P48371A01316* 13 Turn over<br /> (ii) Calculate the mass of cyclohexene that would be formed if all 6.24 g of cyclohexanol were converted into cyclohexene. (iii) After purifying the liquid, 1.64 g of cyclohexene was collected. Calculate the percentage yield of cyclohexene in this preparation. (2) (1) (b) The mixture in the collection flask contains impure cyclohexene, which is immiscible with water. (i) Three steps, shown in the table below, are then carried out for the purposes shown. Complete the table by identifying suitable substances for each step. (3) Step Purpose of step Suitable substance to use To remove acidity To remove inorganic impurities To dry the product (ii) Identify the final step required in order to obtain pure cyclohexene from the dry product. (1)(Total for Question 5 = 9 marks) TOTAL FOR PAPER = 50 MARKS 14 *P48371A01416*<br />

Show answer