Sucrose (C12H22O11) , which is commonly known as table sugar, reacts in dilute acid solutions to form two simpler sugars, glucose and fructose, both of which have the formula C6H12O6 . At 23 °C and in 0.5 M HCI , the following data were obtained for the disappearance of sucrose: Time (min) C12H22O11(M) 0 0.316 39 0.274 80 0.238 140 0.190 210 0.146 What is the rate constant?
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- The main constituents in vinegar are water and ethanoic acid (CH3COOH). In order to determine the concentration of acid in homemade vinegar, a student titrated 25 cm3 of 001 M NaOH against the vinegar. The equation for the reaction is: CH3COOH(aq) + NaOH(aq) ® CH3COONa(aq) + H2O(l) The following titration results were obtained: Burette readings (cm3) Rough 1 2 Final burette reading 20.10 38.90 31.40 Initial burette reading 0.10 20.00 12.50 Volume of vinegar used 20.00 18.90 18.90 (a) What volume of vinegar should be used in the calculation? (b) What is the mole ratio of NaOH:CH3COOH? (c) Calculate the number of moles of alkali in 25 cm3 of NaOH solution used. (d) How many moles of acid were used in the titration? (e) Calculate the…If glucose, phosphate, and glucose-6-phosphate arecombined in concentrations of 4.8, 4.8, and 0.25 mM,respectively, what is the equilibrium constant for thehydrolysis of glucose-6-phosphate at a temprature of258C?Quinine ( C20 H24 N2 O2) is the most important alkaloid derived from cinchona bark. It is used as an antimalarial drug. For quinine, pK, = 5.1 and pK, = 9.7 ( pKp = – log Kp). Only 1 g quinine will dissolve in 1920.0 mL of solution. Calculate the pH of a saturated aqueous solution of quinine. Consider only the reaction | Q+ H2O= QH+ + OH- described by pK, where Q = quinine. pH =
- The normal freezing point of benzene (C6H6) is 5.5 °C. If 30.92 grams of the nonvolatile nonelectrolyte diphenylether (C12H100), are dissolved in 212.1 grams of benzene, what is the freezing point of the resulting solution? Kfp for benzene is 5.12 °C/m. °CUsing your stock solution of 2 M glucose, you need to prepare the following series of glucose solutions for use in an experiment 0.8; 1.5, 1.75 and 2 M. Complete the table to show how you would dilute the sucrose to make 100ml of each of the solutions above.The enzyme urease is widely used for determining urea concentration in blood. The Michaelis constant for urease at room temperature is 2.0 mM and k2 = 2.8 × 104 s-1 at pH = 7.5. Based on the kinetic experiment, when 0.34 mM urease was used, the initial rate of the reaction was determined to be 3.49 M/sec. What is the concentration of urea in blood in unit of mM? Please keep your answer to two decimal place. Please convert all concentration unit to mM in calculation.
- Calculate the boiling point of a solution containing 12g glucose C6H12O6 dissolved in 200g of water H2O. (0.512°C - K of H-0) Answer: 100.17100The standard enthalpy of formation of ammonia at 25°C is -46.3 kJ/mol. Estimate the N-H bond enthalpy at this temperature. (Given: BE(NN) - 941.4 kJ/mol, BE(H-H) 436.4 kJ/mol) 360 kJ/mol × O 383 kJ/mol O391 kJ/mol O459 kJ/mol O475 kJ/mol Your answer is incorrect. GHow many grams of potassium chlorate decompose to potassium chloride and 660. mL of O2 at 128. °C and 726. torr? Round your answer to 3 significant figures. 2KCIO3(s) 2KCI(s) + 302(g) Note: Reference the Conversion factors for non-SI units and Fundamental constants tables for additional information. g × G
- What is the boiling point of 0.800 m lactose in water?(Kb for water is 0.512°C/m)°CFor the following reaction, 4.91 grams of water are mixed with excess chlorine gas. The reaction yields 12.5 grams of hydrochloric acid.chlorine (g) + water (l) hydrochloric acid (aq) + chloric acid (HClO3) (aq) What is the theoretical yield of hydrochloric acid ? grams What is the percent yield of hydrochloric acid ? %46