• 5.01 x 1022 C atoms • 2.76 x 1023 C atoms • 3.31 x 1024 C atoms • 5.50 x 1023 C atoms How many Cl atoms are in 0.0728 g of PCl3? • 1.32 x 1023 Cl atoms • 3.19 x 1020 Cl atoms • 1.81 x 1024 Cl atoms • 9.58 x 1020 Cl atoms Calculate the molar mass of (NH4)2SO4 • 114.11 g/mol • 228.22 g/mol • 132.15 g/mol • 118.14 g/mol 2. Calculate the mass of 4.50 moles of Ca3PO4 • 215 g • 968 g • 87.1 g • 392 g 3. The mineral pyrolusite is a compound of 55Mn and 16O. If 63% of the mass of pyrolusite is due to manganese, what is the empirical formula of pyrolusite?
0.05mol/6M=8.3*10-3 L=8.3mL stock solution c. 100mL-8.3mL=91.7mLwater Add 91.7 water to 6M stock solution to prepare 0.5M acetic acid. Exercise 8: a. 42.35 - 0.55 = 41.8 mL b. The moles of EDTA4- : 0.0189M*(41.8*10-3)L=7.9*10-4mol c. Zn2+(aq)+EDTA4-(aq)—Zn(EDTA)2-(aq) The ratio Zn2+ and EDTA4- is 1:1 The moles of Zn2+= the moles of EDTA4-=7.9*10-4mol d. 7.9*10-4mol*65.39g/mol=0.0517g Zn e.
| |bromobenzene |157.01 |4.00 |0.63g |-31 |1.49 |1 | |magnesium powder |24.305 |4.00 |0.097g |649-651 |1.74 |2 | |ethyl ether |74.12 |2.89 |3ml |-116 |.714 |3 | |benzophenone |182.0694 |3.8 | |49 |1.11 |4 | |triphenylmethanol |260.32 | | |164.2 |1.199 |5 | |5% HCl (aq.) |36.46 | |2ml |-74 |1.0-1.2 |6 | B. References (provide references for the information you've given in the table of reagents) 1. http://fscimage.fishersci.com/msds/03420.htm 2. http://WWW.jtbaker.com/msds/englishhtml/m0088.htm 3. http://fscimage.fishersci.com/msds/90868.htm 4. http://fscimage.fishersci.com/msds/02740.htm 5. http://fscimage.fishersci.com/msds/45870.htm 6. http://fscimage.fishersci.com/msds/95551.htm C. Safety (are any of the reagents used toxic or hazardous? Briefly explain here) 1. Bromobenzene causes skin
The indicator bromthymol blue has a Ka of 1.00 x 10-7. If a 2.00 x 10-3 M solution of the indicator is used, what will be the [H3O+] at the end point, at the intermediate colour between yellow and blue? a) 2.00 x 10-10 M b) 1.00 x 10-7 M c) 5.00 x 10-5 M d) 3.16 x 10-4 M 7. What is the pH of a 0.0100 M hydrochloric acid (HCl) solution? a) 1.00 x 10-2 b) 0.0100 c) 2.000 d) 12.000 8.
That is why once you add the benzoic acid aqueous solution and the CH2Cl2 in the separatory funnel the benzoic acid moves from the aqueous layer into the methylene chloride organic layer. This will occur until an equilibrium is establish between the aqueous layer and the organic layer; that is there is an equal amount of benzoic acid in the aqueous layer and the organic
Experiment: Cyclohexanone from Cyclohexanol aq Abstract: The primary objective of this experiment was to create cyclohexene from the dehydration of cyclohexanol with phosphoric acid. Through the use of simple distillation it was possible to separate the solution. The Agilent 7890A Gas Chromatography System was used to determine the purity of the distillate which verified the success of the separation. Introduction: Alkenes can be prepared by from alcohols by an acid catalyzed dehydration reaction. In the experiment a secondary alcohol (cyclohexanol) is heated with acid (phosphoric acid).
Amine Directed Hydroboration: Methodology and Synthetic Application Rebecca A. Murphy Department of Chemistry, University of California, Berkeley, California 94720 United States firstname.lastname@example.org ABSTRACT Directed hydroboration has been a topic of interest to practitioners of chemical synthesis for over fifty years. With recent advances in amine directed hydroboration, the field has gained momentum by being featured a series of methodological developments and natural product syntheses. In this paper, we highlight the advances made over this time period, as well as discuss recent applications to natural product synthesis. The discovery of hydroboration by H. C. Brown in 1959 sparked frenzied interest in the field of organoboron chemistry.1 Since this initial discovery, organoboron chemistry has become a mainstay in organic synthesis, and continues to be an important tool. A testament to this are the multiple Nobel prizes awarded for research in this area.
Recrystallization of the Benzoic Acid Antonio Roki CHE 311L: Organic Chemistry I Section #2 September 14, 2012 Recrystallization of the Benzoic Acid Summary: The purpose of this experiment was to determine if the process of the Recrystallization is the good method of purification of the solid substance based on its different solubility values. This experiment conducted the purification of the Benzoic acid. The melting point range of the impure Benzoic acid was determined to be 86- 108 °C. Melting point was measured one more time after the process of the purification and was determined to be 111-117 °C. The melting point ranges of the impure and pure benzoic acid seemed reasonable.
c) In fact, the reaction to produce but-2-ene gives a mixture of two different but-2-enes. Explain, with the help of a diagram, how it is possible to have two different but-2-enes. www.chemguide.co.uk Chemguide – questions 3. a) Write the mechanism for the dehydration of propan-2-ol by concentrated sulphuric acid, using the mechanism which goes through a carbocation (carbonium ion) intermediate. b) The mechanism for the dehydration of ethanol doesn't go through a carbocation intermediate, but instead uses the mechanism: Describe and explain in words what is happening in this mechanism. c) Why does ethanol use this mechanism rather than one