17) An unknown hydrocarbon compound was analyzed for hydrogen by elemental analysis and results show that itcontains 15.88 % H. What is the empirical formula?A) C,H,B) CgH18C) C12H2718) What is the concentration in ppm of a 3 70 L solution (d = 1.00 g/ml) containing 4 21 x 10:7 ka of the pesticide

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Answered: 17) An unknown hydrocarbon compound was…

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter13: The Chemistry Of Solutes And Solutions

Section: Chapter Questions

Problem 42QRT

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Five white, 500-mg uncoated ascorbic acid (AA) tablets with an average weight of 0.6152-g were pulverized in a mortar. A sample of the powdered ascorbic acid weighing 0.4700-g was placed in an iodine flask and was dissolved in 50-mL H2SO4 then 5-g of KBr was added to the resulting solution. The solution was titrated with 47.81-mL of 0.09640 N STD. KBrO3 to reach a faint yellow endpoint then 3-g KI and 5-mL Starch TS. The blue color solution is then titrated with 2.73-mL of 0.09123 N STD. Na2S2O3 to reach the disappearance of the blue iodostarch complex. MW: KBrO3 = 167.0 ; KIO3 = 214.0 ; Na2S2O3 = 158.11 ; C6H8O6 = 176.12 Compute the milligrams of pure AA per tablet from the assay. 293.3 mg 502.5 mg None of the choices 383.9 mg
The CO in a 20.3-L sample of gas was converted to CO2 by passing the gas overiodine pentoxide heated to 150℃, and I2 was distilled and collected to 8.25 mL of 0.01101 M Na2S2O3, then back titration with 2.16 mL of 0.00947 M I2 solution.Calculate the mg of CO (28.01 g/mol) per liter of sample.a. I2O5(s) + 5CO (g) → 5CO2(g) + I2 (g)b. I2(aq) + 2S2O32- (aq) → 2I-(aq) + S4O62- (aq)
1. An acid solution is prepared by dissolving 19.264 grams of pure KHC2O4.H2C2O4.2H2O in water and diluting to exactly 900 ml. Fifty milliliters (50.00 mL) of this solution are neutralized by 35.00 ml. of KOH solution. What is the normality of each solution? 2. What mass of Ca(OH)2 is present in a sample if it is titrated to its equivalence point with 44.02 mL of 0.0885 M HNO3? The balanced chemical equation is as follows: 2HNO3 + Ca(OH)2 → Ca(NO3)2 + 2H2O ; Balanced.
The ethyl acetate concentration in a alcoholic solution was determined by diluting a 10.00 mL sample to 100.00 mL. A 20.00 mL portion of diluted solution was refluxed with 40.00 mL of 0.04672 M KOH. Ater cooling, the excess OH2 was back-titrated with 3.41 mL of 0.05042 M H2SO4. Calculate the amount of ethyl acetate (88.11 g mol) in the original sample in grams.
Zhongli is a speleologist tasked to analyze the CaCO₃ content of a limestone stalactite. A 5.0000-g sample was dissolved in 25.00 mL of 1.350 M HCl, it was then heated to expel any CO₂ formed. The excess HCl was titrated to a phenolphthalein end point, it used 37.50 mL of 0.1200 M NaOH. What is the reaction for the digestion of the limestone sample A. 2 NaOH + CaCO₃ ⇌ Na₂CO₃ + Ca(OH)₂ B. CaCO₃ ⇌ CaO + CO₂ C. 2 HCl + CaCO₃ ⇌ CaCl₂ + H₂O + CO₂ D. NaOH + HCl ⇌ NaCl + H₂O
Calculate the amount of caffeine extracted from coffee beans using 1.0215g of the sample. The volume of 0.0252N H2SO4 added to the extract was 25.4 mL, the excess titrated by 21.75 mL of 0.02115N NaOH. Each mL of 0.02 N H2SO4 is equivalent to 3.8858 mg of caffeine (C9H10O2). The percentage of caffeine is:
Mass of KxFe(C2O4)y · zH2O : 4.70 g Mass of sample : 0.175 g Mass of FeCl3 used in preparation : 1.60 g Molarity of standard NaOH used : 0.100 V1, volume of standard NaOH required for first equivalence point : 7.750 mL V2, volume of standard NaOH required for second equivalence point : 19.70 mL Calculate the percent of potassium in the sample :
1. A solution of HClO4 was standardized by dissolving 0.4008 g of primary-standard-grade HgO in a solution of KBr: HgO(s) + 4Br- + H2O → HgBr42- + 2OH- The liberated OH2 consumed 43.75 mL of the acid. Calculate the molar concentration of the HClO4. 2. A 0.4723-g sample of primary-standard-grade Na2CO3 required 34.78 mL of an H2SO4 solution to reach the end point in the reaction: CO32- + 2H+ → H2O + CO2 (g) What is the molar concentration of the H2SO4? Using step-by-step process.
A mixture contains Na2CO3, NaOH, and inert matter. A sample weighing 1.500 g requires 28.85 mL 0f 0.5000 M HCl to reach a phenolphthalein end point, and an additional 23.85 mL to reach a methyl orange end point. What is the percentage of NaOH in the sample? a. 8.5% b. 50.68% c. 6.67% d. 20.56% e. 84.27%
The formaldehyde content of a pesticide was determined by weighing 0.9327 g of the liquid sample into a flask containing 50.0 mL of 0.08624 M NaOH and 50 mL of 3% H2O2. It was heated then cooled. After cooling, the excess base was titrated with 27.8 mL of 0.06325 M H2SO4. Calculate the percentage of HCHO in the sample.
84 mL of 0.060 M NaF is mixed with 28 mL of 0.15 M Sr(NO3)2. Calculate the concentration of Sr2+ in the final solution. Assume volumes can be added. (Ksp for SrF2 = 2.0 × 10-10) A. 0.038 M B. 0.00012 M C. 0.015 M D. 0.045 M E. 0.075 M
Given: 0.35g NaCl, 0.25 g NaHCO3, 0.15 g KCl & 2 g C6H12O6 are present in 100 mL ORS solution (MW: Na: 23, K: 39, Cl: 35, H: 1, C: 12, O: 16) Calculate the total amount of chloride expressed in mmol/L present in the prepared solution 60.34 mmol/L 90.10 mmol/L a 111.11 mmol/L b 29.76 mmol/L c 80.61 mmol/L d 20.27 mmol/L

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17) An unknown hydrocarbon compound was analyzed for hydrogen by elemental analysis and results show that it contains 15.88 % H. What is the empirical formula? A) C,H, B) CgH18 C) C2H7