с. Pivo 1. (MeO)2PCH2N2, KO-BU, THF, –78 °C TESO** 2a. DIBAL-H (2.1 eq), CH2CI2, –78 °C 2b. Rochelle's salt workup 83% OHC n-C5H11 Cs Scanned with CamScanner
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- 0o Turkcell 3G 03:22 @ %27D moiar voiume or tne etnanor (d 0.789 g/cm'; d-1.00 g cmr"; Mw for water-18 g mot', ethanol-46.07 g mot') 5. The addition of 5.00 g of a compound to 250 g of naphthalene lowered the freezing point of naphthalene by 0.780 K. Calculate the molar mass of the compound. (K6.94 K.kg/mol for naphthalene) 6. The vapour pressure of a liquid in the temperature range 200 K to 260 K was found to fit the expression In(p/Torr) - 18.361 - 3036,8/(T/K). Calculate the enthalpy of vaporization of the liquid. 7. At 25" C, water rises through 7.36 cm in a capillary of radius 0.20 mm. Calculate its surface tension at this temperature. (density of water is 0.9971 and gravity is 9.81 m/s') lenovoSTANDARDIZATION OF NAOH SOLUTION A 0.4047 g sample of primary standard grade potassium hydrogen phthalate (MM = 204.23) was dissolved in distilled H2O. The solution required 22.42 mL of the NaOH solution to reach the phenolphthalein end point. a.) Calculate the number of mmoles of KHP. b.) How many moles of NaOH will react with the KHP dissolved in water? c.) Calculate the molarity of the NaOH solution.7. Which salt is the least soluble: (а) СоСОз (Ksp %3D 1.0х 10-12) (b) СаСОз (Кsp %34.8 х 10-9) (с) ВаСОз (Ksp 3 8.1х 10-9), = =
- FSC 8 1921. Brightspace A Aktiv Chemistry C D Z < Q + # At F2 @ 2 What volume in mL of 0.3000 M NaCl solution is required to produce 0.2700 moles of NaCl? W S app.101edu.co Walmart - Hiring Ce... X F3 X # 3 11. Unit 12: Late Adulthood - Develo X E JC 4 D F4 с 144 $ JU F5 R LL F ► 11 % 5 V F6 t 44 T G A 6 F7 Simulation play - Labster B Y H F8 & 7 8 U N Question 7 of 9 DELL F9 X D * 8 J F10 ( M Walmart - Hiring Center 9 F11 JI K 2 O ) O F12 L P 4 : 7 +/- PrtScr W 8 Insert { ( **Calculate the normality of 0.2M Na2CO3 (M.wt = 106).If a 5.00L of a 5.0M soluticn sadium chluride CCCI) is Ciluted to a volume cf l0.0L, vhat is the new cocentretion?
- The distribution coefficient of hydrogen sulfide between benzene and water at 25 degrees Celsius is 5.9880. What is the minimum volume of benzene at 25 degrees Celsius necessary to extract in a single step 80% of the hydrogen sulfide from 1 liter of 0.15 molar aqueous solution of hydrogen sulfide?a.) 0.1336b.) 23.9520c.) 0.6680d.) 1.5030E.) none of the aboveQu 1. George Olah (b. 1927 – d.2017), Professor at University of Southern California and winner of the 1994 Nobel Prize in chemistry, famously made a career of quantitatively preparing and characterizing exotic cations (e.g. CH;* – yes, it's 'a thing'!) in 'superacid' solutions. Dissolving tetramethylcyclobutenyl dichloride (X, 3,4- dichloro-1,2,3,4-cyclobut-1-ene) in the super Lewis acid (the solvent is excess SbFs, SO2, -65 °C) generated a cationic species, Y, with an 'H NMR spectrum (60 MHz, -75 "C), showing a single peak. Hint: SbFs is highly 'halophilie', SbFs + Cl -> [SbF;CI]r. c.f. AICI, and FeCls. (a) Draw the Lewis structure of Y, all resonance forms, and explain the 'H NMR chemical shift. CI SbFg, SO2 5. Y "CI - 75 "C i 81.0 ii 8 3.7 iji 80 iv 8 -2.0 ppm (b) Which chemical shift, 8, best fits Y (circle)? Explain (briefly): (c) When X was dissolved in a different solvent (FSO3H, SO2, -78 °C) a different cation, Z, appeared "completely stable for at least 2 weeks". The 'H NMR…1.5m 6A 200. mL solution that is 6.7 x 104 M in Cu²+ is mixed with 0.30 mole NH3. There is no change in volume as NH3 is bubbled in. What is the final [Cu]? Kf Cu(NH3)42 = 5.6 x 10¹¹ 124 . Kover= ksp kf 5." -9 Cu2++NH₂ CU(NH3) 4² 2+
- -2 The PPm Concentration of 4.5 *la M Solution off Lif is I1940fやPm D 196. PPm 3 1950 PPmBA9 View Assessment W. 4.9 Homework-Antiderivatives - X W 4.7 Homework-Optimization - M X blackboard.uob.edu.bh/ultra/courses/_19917 1/outline/assessment/ 452520 1/overview/attempt/_1748964 1?courseld= 1991 1 Point Question 10 Choose the correct option Which of the following aqueous solutions has the highest boiling.. point (assume 100% dissociation for all soluble ionic compounds)? a) 0.35 m Na2SO4 b) 0.35m CeH12O6 c) 0.35 m Al(NO3)3 d)0.35m K2CO3 e) 0.35 m NaCI bmitted late. 行ality al, g. on te ew led ed in X= A solution was prepared by dissolving 140.0 g of KCl in 315 g of water. Calculate the mole fraction of KC1. (The formula weight of KCl is 74.6 g/mol. The formula weight of water is 18.0 g/mol.) Express the mole fraction of KCl to two decimal places. View Available Hint(s) Submit 5 ΑΣΦ Part B - Use the definition of molality 001 mol/ka 12 of 33 ? P Pearson Review I Constants I Periodic Table A solution was prepared by dissolving 140.0 g of KCl in 315 g of water. Calculate the molality of KC1. (The formula weight of KCl is 74.6 g/mol. The formula weight of water is 18.0 g/mol.) Express the concentration of KCl in molality to two decimal places. ▸ View Available Hint(s) >