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- 1. Calculate the percent by volume of acetic acid by fermentation. Assumptions: No volume changed during fermentation and conversion efficiency is 85%. Overall chemical reaction facilitated by Acetobacter aceti:C2H5OH + O2 = CH3COOH + H2OGiven: Volume of 6% C2H5OH = 3 LMolar mass of C2H5OH = 46.07 g/molMolar mass of CH3COOH = 60.06 g/molDensity of C2H5OH = 0.789 g/mLDensity of CH3COOH = 1.05 g/mLWhen a pure sample of tert-butyl bromide is analyzed by gas chromatography, two components are usually observed. One of them is tert-butyl bromide and the other one is a decomposition product. As the temperature of the injector is increased, the amount of the decomposition product increases and the amount of tert-butyl bromide decreases.a. What is the structure of the decomposition product?b. Why does the amount of decomposition increase with increasing temperature?c. Why does tert-butyl bromide decompose much more easily than tert-butyl chloride?1.Each of the student statements below is wrong. You will need to explain why they are not correct. (a) All my compound dissolved right away in the small amount of solvent I added at room temperature, and I didn’t need to heat it at all. This means I’m going to get lots of pure compound out. (b) I did a recrystallization of naphthalene and my percent recovery was very high (99%), so I must have pure product. (c) When you’ve dissolved all your compound in hot solvent, and you’re in a hurry, it’s ok to just place it straight into the ice bath.
- Explain the correlation between the structure of the compounds (b-Carotene, chlorophyll ) and the polarity of the solvent (hexane,70/30 hexane/acetone) that separated the compounds on the column. (TLC plate experiment on spinach)Please give an explanation and show work step by step: Write a balanced equation for the combustion of benzoic acid, C6H5COOH, to give CO2 and H2 How many milligrams of CO2 and of H2O will be produced by the combustion of 4.635 mg of benzoic acid? Combustion of 732 mg of an unknown organic compound gave 16.432 mg of CO2and 2.840 mg of H2O. (a) Find the wt% of C and H in the substance. (b) Find the smallest integer mole ratio of C:H in the compound.Extraction of Caffeine Post-lab 1. What group of organic compounds does caffeine belong to? 2. Draw the structure of caffeine as a line formula. Redraw the structure of caffeine,showing all carbon and hydrogen atoms. 3. What is the molecular formula for caffeine? Use the molecular formula of caffeine tocalculate its molecular weight. 4. What does it mean for two solvents to be immiscible? 5. On the report sheet, you calculated your percent recovery of caffeine. a. If your percent was less than 90%, give at least one reason why it was less. b. A group of students have their percent yield more than 100%, give at least one reasonwhy it was more than 100%. Do NOT simply say “human error.” Be specific about the typesof errors (human or otherwise) that may have occurred, leading to a recovery more than eorequal to 100% (Is this possible Why?) 6. Based on what you observed during this experiment, is dichloromethane denser OR lessdense than water? Explain your reasoning. 7. Based on what…
- Each of the student statements below is wrong. Explain why they are not correct. (a) All my compound dissolved right away in the small amount of solvent I added at room temperature, and I didn’t need to heat it at all. This means I’m going to get lots of pure compound out. (b) I did a recrystallization of naphthalene and my percent recovery was very high (99%), so I must have pure product. (c) When you’ve dissolved all your compound in hot solvent, and you’re in a hurry, it’s ok to just place it straight into the ice bath.1. Which of the following compounds can form hydrogen bonds with water?a. octaneb. HClc. NaCld. acetic acid2. Maria wants to determine the percent water content of an unknown hydrate of AB. Given the following data:mass of empty crucible - 12. 2784gmass of AB · xH20 + crucible - 17.4960gmass of AB + crucible - 15.1314gCalculate the % water content of the hydrate3. From the above data, give the correct formula for the hydrate. (AB₂ Molar mass = 129.84 g/mol)PREPARATION OF n-PROPYL PROPANOATE Q1) How can you tell, by looking at the refluxing set-up, that the reaction between n-propanol and propionic acid is over? Q2) When assembling the distillation set-up, why is it important to place the tip of the thermometer at the same height as the exit to the side arm of the round-bottom flask?
- Task 6. An unknown hydrocarbon fuel combusts with air; the resulting products have the following dry volumetric analysis: 12% CO₂, 1.5% CO, 3% O₂, and 83.5% N₂. Calculate the percent excess air. C13.5 H25.8 Percent of theoretical air = 111.3%1. Calculate the percent by volume of acetic acid by fermentation. The volume of 6% C2H5OH is 3L. Assumptions: No volume changed during fermentation and conversion efficiency is 85%. Its overall chemical reaction facilitated by Acetobacter aceti: C2H5OH + O2 = CH3COOH + H2OA student rushed through this experiment. Describe the effect that the following procedural changes would have on the percent recovery of acetanilide. Briefly explain the basis of each answer.(a) Rather than adding 0.5-mL portions of boiling solvent to the acetanilide, the student added 5-mL portions of boiling solvent.(b) The student did not pre-heat the gravity filtration apparatus.(c) The student forgot to cool 5 mL of solvent in Part 5 and washed the crystals with room-temperature solvent.
