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- Tris(pentatluorophenyl)borane, commonly known by its aeronym BARF, is frequently used to initiate polymerization of ethylene or propylene in the presence of a catalytic transition metal compound. It is composed solely of C, F, and B; it is 42.23% C and 55.66% F by mass. a. What is the empirical formula of BARF? b. A 2.251-g sample of BARF dissolved in 347.0 mL of solution produces a 0.01267-M solution. What is the molecular formula of BARF?1. Find the number of millimoles of solute in a. 226 ?? of 0.320 ? HClO4. b. 25.0 ? of 8.05 ? 10−3 ? K2CrO4. c. 6.00 ? of an aqueous solution that contains 6.75 ??? of AgNO3. d. 537 ?? of 0.0200 ? KOH. 2. Describe the preparation of a. 5.00 ? of 0.0500 ? KMnO4 from the solid reagent. b. 4.00 ? of 0.250 ? HClO4, starting with an 8.00 ? solution of the reagent. c. 400 ?? of a solution that is 0.0250 ? in I2, starting with MgI2. d. 200 ?? of 1.00% (?/?) aqueous CuSO4 from a 0.365 ? CuSO4 solution. e. 1.50 ? of 0.215 ? NaOH from the concentrated commercial reagent [50% NaOH (w/w), ?? ?? = 1.525]. f. 1.50 ? of a solution that is 12.0 ??? in K+, starting with solid K4Fe(CN)6. 3. Exactly 75.00 ?? of a 0.3132 ? solution of Na2SO3 were treated with 150.0 ?? of 0.4025 ? HClO4 and boiled to remove the SO2 formed. a. What was the mass in grams of SO2 that was evolved? b. What was the concentration of the unreacted reagent (Na2SO3 or HClO4) after thereaction was complete?What is the percentage of total acid expressed as acetic acid in a sample of vinegar if 4.0g of vinegar requires 29.5ml of 0.153N KOH for an endpoint with phenolphthalein indicator? (molar mass of acetic acid: HC2H3O2 = 60.05g/mol a. 3.995% b. 6.776% c. 8.650% d. 12.68%
- 3.A sample is known to contain NaOH, Na2CO3 NaHCO3 or compatible mixture of these together with inert matter. With methyl orange, a 1.100 g sample requires 31.40 mL of HCl ( 1.00 mL is equivalent to 0.0140g CaO). With phenolphthalein indicator, the same weight of sample requires 13.30mL of the acid. What is the percent composition of the sample? ww ww3. How would you prepare 50.0-ml portions of standard solutions that are 0.00500 M, 0.00200 M, and 0.00100 M in Na" from the 0.0100 M Na" solution?The mass of magnesium fluoride that is dissolved in 150 mL of a saturated solution is _______ grams. The volume of water needed to dissolve 0.0671 grams of calcium hydroxide is ______ L.Assume no volume change upon addition of the solid.
- 86.5 g of MgCl2 (m.m. = 95.211 g mol−1), asoluble salt, is dissolved in pure water. Howmany moles (to one decimal place) of soluteparticles does this result in?A. 0.9 B. 1.8 C. 2.2 D. 2.7 E. 86.5What happens when the two solutions shown are combined? The Ksp of strontium sulfate, SrSO4, is 3.8x10-/. Item image: 0.0010 M 0.0010 M SrINO32 Na SO4 50mL 50 mLA 17.5 mL portion of a 0.1050 M Na2CO3 solution is added to 46.0 mL of 0.1250 M NaCl. What is the concentration of sodium ion in the final solution? Na2CO3->2Na+ + CO3-2 NaCl ->Na+ + Cl- Hints: 1) What is the total number of mols of Na+ from both sources? 2)What is the total volume after mixing?
- Solve correctly please. A 100 mL solution is prepared by weighing 1.50 g from the mixture of KI and KBr. When the 20 mL part taken from this solution is titrated with 0.02 M AgNO3 solution, 105 mL is consumed. Accordingly, calculate the percentage of Kl in the mixture. (KI: 166 KBr: 119 g/mol) A. 56.3 B. 59 C. 41 D. 43.7 (Gpt/ai wrong answer not allowed)3. What mass of BaCl2 is needed to dissolve in 1.2 kg water to prepare 0.500m BaCl2 solution? Rubrics for ScoringWhat is the concentration of Cu2+ in a 1 mL solution taken from a 10 mL solution of (1) 0.040 M in CuSO4 and 0.050 M in tartrate(2) 0.040 M in CuSO4 and 0.100 M in tartrate(3) 0.040 M in CuSO4 and 0.150 M in tartrate all with distilled water (to equal the 10 mL)