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- 5) King Krator the Merciless has called on Pogo, a humble goldsmith, to make a crown for theKing. He gives Pogo exactly 14 oz of pure gold to fashion the crown and tells him that if hecheats the King, he will pay with his life ! Pogo leaves with the gold; he and his apprenticesspend two weeks in making the crown; finally he returns to the court. When Pogo returns withthe crown, King Krator finds that the crown weighs 397.25 grams, and has a volume of20.58cm3. King Krator asks the court wizard for the density of gold, and Wizard tells the Kingthat gold has a density of 19.3 times that of an equal volume of spring rain. Krator demands aslate, makes a few calculations, then sternly lifts his head to stare at Pogo. Does Pogo's headroll ?You may mark all of the following directly on this one structure if you make a color coded key that is EASY for me to follow: Salpha carbons color: 8chiral carbons color: 8anomeric carbons color: Speptide bonds: 1. 2. 3. 4. Draw structure: Explanations for why any of the above NOT present: 5. 10Does your structure have the ability to form a (circle): hemiacetal or acetal or neither if methanol is added in the presence of heat and acid? Draw the product.A solution of 75 mM tartaric acid (C4H,O6) in water is used as a standard in HPLC analysis. How many grams of C4H,O6 ·H2O are needed to make up 10 ml of solution?
- = (1) H H H H (2) (3)Hexamethylenediamine (CH16N2) is one of the starting materials for the production of nylon. It can be prepared from adipic acid (CH1004) by the following overall reaction: C6H1004(1) + 2 NH;(g) + 4 H2(g) – CH16N2(1) + 4 H,0()A student was asked to determine the concentration of ammonia, a volatile substance, in a commercially available cloudy ammonia solution used for cleaning. First the student pipetted 25.00 mL of the cloudy ammonia solution into a 250.0 mL conical flask. 50.00 mL of 0.100 mol L-¹ HCl(aq) was immed added to the conical flask which reactedwith the ammonia in solution. The excess (unreacted) HC1 was then titrated with 21.50 mL 0. 050 M Na2CO3 (aq). Calculate the concentration of the ammonia in the cloudy ammonia solution.
- 1597 59 S ||| 2 O CHEMICAL REACTIONS Calculating ion molarity using solute mass A chemist prepares a solution of magnesium bromide (MgBr₂) by measuring out 2.1 g of MgBr, into a 300. mL volumetric flask and filling to the mark with distilled water. V Calculate the molarity of Br anions in the chemist's solution. Be sure your answer is rounded to the correct number of significant digits. Microsoft O W Microsoft Microsoft 6.52.210... esc mol L Explanation 18 ! 1 Check 9,206 2 # 3 103 NOV 6 X $ 4 O 67 5⁰ % 5 stv 6 Y 2 & 7 © 2022 McGraw Hill LLC. All Rights Reserved. U * CO 66 8 A 9 I 1 Terms of Use | Privacy Center | Accessibility W 0 0 P { [ do F }16 The odor of fish is due primarily to amines, especially methylamine (CH3NH₂). Fish is often served with a wedge of lemon, which contains citric acid. The methylamine reacts with the citric acid to form an odorless product, methylammonium citrate, thereby making less-than- fresh fish more appetizing. K₁ for CH3NH₂ = 4.407 × 10-4 CH₂NH₂ (aq) + H₂O(1)⇒ CH₂NH3(aq) + OH(aq) A. B. What is the pH of a solution that is 0.7625 M in methylamine at 25.0 °C? pH = Please provider your answer below. t Check answer → A (0) Check answer What is the pH of a solution that is 7.007×104 M in methylamine? pH = Please provider your answer below. (0(1) Hydrofluoric acid, HF(aq), cannot be stored in glass bottles because compounds called silicates in the glass are attacked by the HF(aq). For example, sodium silicate, Na2SiO3, reacts in the following way Na2SiO3(s) + 8 HF(aq) → H2SiF6 (aq) + 2 NaF(aq) + 3 H2O(l) Atomic weights (g/mol): Na=23, Si=28, O=16, H=1, F=19 (a) Balance the above chemical equation that represents the reaction. (b) How many moles of sodium silicate can be attacked by 9.0 moles of hydrofluoric acid? (c) How much each (in grams) of NaF(aq) and water will be produced from 9.0 moles of hydrofluoric acid? (d) If 200 grams of HF(aq) attacked 1.5 moles sodium silicate , identify the limiting and excess reagents (e) How much of the excess reagent remains unreacted? (f) If the reaction in (d) produces 40.0 grams of NaF, calculate the percent yield.
- 2 2 X. Fo fff O-S-CH3 01S1O 0-S-CH3 F OTS CH3NH DMSO Br DMF Br EtOH CH3NH DMSO Yor + Br - Br X -S-CH3 -S-CH3 NHCH3 + OTS OP NHCH3 + FWrite chemical equations for each of the following chemical and physical processes: (a) Neutralization of an aqueous solution of barium hydroxide by the hydronium ion(b) Reaction of 1 mole of aluminum with I2(s) to form aluminum iodide(c) Conversion of 1 mole of O2(g) to O3(g)(d) Dissolving C12H22O11(s) (sugar) in water(e) Combustion of CH3OH(l)(f) Thermal decomposition of 1 mole of solid sodium azide to produce solid sodium and nitrogengas(g) Photodissociation of hydrogen gas(h) Fusion of gold2.) Five standardized dilutions of aqueous lead(II) chromate solution were prepared by adding a volume of 0.0010 M PbCrOa(ag) from a buret and then diluting the solution with deionized water to a total volume of 100.0 mL. Use the provided information to determine [CrO42] in each. Hint: enter the decimal before the scientific notation. Mixture Initial Buret Reading (mL) Final Buret Reading (mL) [CrO4?] (M) 5 16.83 42.60 ? x 104
