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The colorimeter was used to measure the absorbance of each of a series of (FeSal)^+ solutions. A standard curve was constructed by plotting the absorbance vs. the concentration (M). The slope and y-intercept were found to be 1510 and 0.001, respectively. An aspirin sample was prepared, following the procedure given in the experiment: hydrolyzing 0.159 g of it with 5 ml, of 1 M NaOH (reaction 1), diluting this mixture to 50.00 mL (forming solution A, and taking a 1.00 mL aliquot of this solution and diluting it to 50.00 mL with 0.02 M Fe(III) (forming solution B - reaction 2). The absorbance of solution B was measured to be 0.380. DATA ANALYSIS step 3: Use the measured absorbance and the standard curve's slope and y-intercept to calculate the concentration of [FeSal]+ in solution B. How many moles of [FeSal)+ were in the 50.00 mL of solution B? How many moles of sodium salicylate were in the 1.00 mL aliquot of solution A used to prepare solution B? Given the number of moles of sodium salicylate in 1.00 mL of solution A (calculated above), how many moles are in the 50.00 mL of solution A? Based upon the number of moles of sodium salicylate calculated in part, how many moles of acetylsalicy1ic acid, C_9H_8O_4, were in the aspirin sample? Use mass of the aspirin sample (given in the procedure section above) and the answer to part, converted to calculate the mass percent of acetylsalicylic acid, C_9H_8O_4, in the aspirin sample.
Balance the following redox equation in acid. In the blank put the correct stochiometric coefficient (0, 1, 2, etc). Balance the following redox equation in base. In the blank put the correct stochiometric coefficient (0, 1, 2, etc.). Balance the following redox equation in base In the blank put the correct stochiometric coefficient (0, 1, 2, etc).
A balloon is inflated with a gas. The pressure outside the balloon is 755 torr and the temperature of the surroundings and the balloon contents is 35 degree C. What is the pressure exerted by the gas inside the balloon? A balloon containing 0.100 moles of The gas has a volume of 2.45 liters at 25degreeC and a pressure of 760 torr. If the balloon rose into the atmosphere and its temperature changed to 15 degree C and its pressure decreased to 720 torr. what would the volume of the balloon be.
What is the lattice energy of magnesium sulfide? Mg(s) rightarrow Mg(g) Delta H degree_rxn = 148 kJ/mol Mg(g) rightarrow Mg^2+(g) + 2c^- Delta H degree_rxn = 2186 kJ/mol Sg(s) rightarrow 8S(g) Delta H degree_rxn = 2323 kJ/mol S(g) + 2e^- rightarrow S^2-(g) Delta H degree_rxn = 450.kJ/mol 8Mg(s) + 5g(s) rightarrow 8MgS(s) Delta H degree_rxn = -2744 kJ/mol MgS(s) rightarrow Mg^2+(g) + S^2-(g) Delta H degree_rxn = ? A) 2720. kJ/mol B) -2272 kJ/mol C) 3406 kJ/mol D) -3406 kJ/mol E) -2720.kJ/mol
From this IR, WHat is the molecular structure?
10 20 30 40 50 60 70 80 900 100 110 120 Carbon strong rsaturated C- H Stretch 4000 HAVENUITBER ester 3664 84 1778 B 288 31 962 36 620 44 2gs7 32 i 471 IB 270 62 923 7 596 1a C 2964 53 452 31 220 79 879, 4 403 74 2944 60 1430 3 Be 77 911 9 2876 70 1432 46 24 72 749 13 1811 6 139 27 020 46 680 60 Ina R 1371 31 973 16 639 62
Organic chemistry 2 Carboxylic Acid
When levulinic acid (CH_3CCH_2CH_2CO_2H)was hydrogenated at high pressure over a nickel catalyst at 220 degree C, a single product, C_5H_8O_2, was isolated in 94% yield. This compound lacks hydroxyl absorption in its IR spectrum. What is a reasonable structure for the compound? Explain how it was formed in this reaction.
Which of the following reactions are spontaneous (favorable)? A. 2Mg(x) + O_2y rightarrow 2MgO(s) Delta G = -1137 kJ/mol B. NH_3(g)+ HCl(g) rightarrow NH_4Cl(s) Delta G = -91.1 kJ/mol C. AgCl(s) rightarrow Ag^+(aq) + CI^-(aq) Delta G = 55.6 kJ/mol D. 2H_2(g)+ O_2(g) rightarrow 2H_2O(g) Delta G = 456 kJ/mol E. C(s) + H_2O(l) rightarrow CO(g) + H_2(g) Delta G = 90.8 kJ/mol F. CH_4(g) + 2O_2(g) rightarrow CO_2(g) + 2H_2O(l) Delta G=-820 kJ/mol Check all spontaneous reactions. Reaction A Reaction B Reaction C Reaction D Reaction E Reaction F
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