equal to the average atomic weight‚ also called the average molar mass. Percent Composition of Compounds and Empirical Formulas (Sections 3.5 and 3.6) The chemical formula of a compound shows the exact molar ratio of the different elements in the compound. The numbers of each element are recorded using a subscript after each chemical symbol. The subscript of one is understood and never written. The percent
Premium Stoichiometry
REPORT! EXPERIMENT#5‚6! MANPREET KAUR KHAIRA! LAB PARTNER: VIAN RAIES! The purpose of this lab exercise was to perform the bromination of (E)-1‚2-diphenylethene (trans-stilbene) by addition reaction in which bromine was added across the double bond to yield a vicinal dibromide. The next step was to perform a double elimination reaction by product gained to synthesize an alkyne‚ that is‚ 1‚2-diphenylacetylene. The two major techniques used in this lab were TLC analysis and UV-vis spectroscopy. TLC technique
Premium Chemistry Oxygen Chemical reaction
2-dibromo-1‚2-diphenylethane | 0.204g | Diphenylacetylene | 0.087g | Theoretical yield | 0.107g | Percent yield | 81.3% | Melting point range of diphenylacetylene | 57- 60°C | Average melting point | 58.5°C | Average literature melting point | 60.0°C | Percent error of melting point | 2.5% | Calculations: Theoretical yield: Limiting reagent (LR) x M.W. (LR) x Mole to Mole ratio x M.W. (product) = Theoretical yield of product. 0.204g 1‚ 2-dibromo-1‚ 2-diphenylethane x (1mol 1‚ 2-dibromo-1
Premium Stoichiometry Sodium Yield
this experiment‚ the excess reagent is acetic acid because it is not expensive and can easily be removed for the reaction. The acetic acid and isopentyl alcohol are removed by extraction with sodium bicarbonate and water. The limiting reagent is isopentyl alcohol. A limiting reagent is completely consumed when
Premium
Copper(II) oxide will be synthesized from a known mass of copper(II) sulfate pentahydrate. Using the relationship of the balanced equation‚ and other stoichiometry relationships‚ you will calculate a theoretical yield of CuO‚ and your actual yield. You then will calculate a percent yield. Copper(II) sulfate pentahydrate will be dissolved in water and reacted using a double replacement reaction with sodium hydroxide. The addition of hydroxide ions to a solution containing copper(II) ions results
Premium Stoichiometry Yield Sodium hydroxide
CHEMICAL REACTIONS OF COPPER AND PERCENT YIELD Objective To gain familiarity with basic laboratory procedures‚ some chemistry of a typical transition element‚ and the concept of percent yield. Apparatus and Chemicals |0.5 g piece of no. 16 or no. 18 copper wire |evaporating dish | |250 mL beaker (2) |weighing paper | |concentrated HNO3 (4 – 6 mL)
Premium Chemical reaction Aluminium Chemistry
(III) chloride (FeCl3) was then measured in two separate clean graduated cylinders (5mL in each cylinder) and 5mL was added to each test tube. Following the addition‚ a lighter magenta color resulted in the test tube with the experimental product yield‚ when compared to the tube containing the salicylic acid‚ which turned a darker shade of
Premium Aspirin Salicylic acid Acetic acid
anhydride was prepared with the process of Esterification. By using the reflux technique‚ extraction‚ washing and drying the Isoamyl acetate or banana flavor was isolated from the acetic acid. This was then weighed and computed for the percent yield. The theoretical yield and the weighed value must have close values in order for this experiment to be successful. Keywords: fruit flavors‚ banana flavor‚ acyl esterification‚ reflux‚ extraction‚ washing‚ drying‚ drying agents Introduction Esters are a
Premium Ester Carboxylic acid Acetic anhydride
the rates of reaction‚ especially SN2 reactions‚ where the strength of the nucleophile determines the rate of reaction. As far as the reaction properties are concerned‚ nucleophilic attack by nitrogen on iodoethane yields N-ethylsaccharin‚ whereas nucleophilic attack by oxygen yields O-ethylsaccharin. The product can be either of these combination of both saccharin. Determining the final product may be difficult but there are some properties which are used. For instance‚ N-ethylsaccharin is more
Premium Nuclear magnetic resonance Nucleophile Chemical reaction
Abstract: This experiment involved a reaction between anthracene and maleic anhydride via a Diels Alder reaction to yield 9‚ 10-dihydroanthracene-9‚10-α‚ β-succinic anhydride. Anthracene was the diene and maleic anhydride was the dienophile. The percent yield of the crude product was 69.03%. Following recrystallization of the product using xylene and vacuum filtration‚ a percent yield of 37.42% for the recrystallized product was collected. This was low due to the fact that some of the crude product
Premium Infrared spectroscopy Erlenmeyer flask Infrared