Lexington Overstreet 9/14/2012 Title: Determination of Density of an Unknown Liquid Unknown sample number P121736-LF12 First Combination of Equipment Employed 10 mL graduated cylinder, one decimal place balance. Summary of Experimental Procedure A ten milliliter graduated cylinder was filled with the liquid so that the meniscus was exactly at the 10.0mL calibration mark. The liquid sample was then carefully poured into a clean, dry weighing vial which had been pre-weighed with its cap. The vial was capped, reweighed, and the density of the liquid computed using the formula: Density (g/mL) = Sample Weight (g)Sample Volume (mL) This procedure was repeated three times. Experimental Data Trial 1 Trial 2 Trial 3 Sample Volume 10 mL 10 mL 10 mL Weight sample + capped vial 26.5g 26.5g 26.3g Weight vial + cap 15.5g 15.4g 15.4g Sample weight 11.0g 11.1g 10.9g Calculated Results Trial 1 Trial 2 Trial 3 Density of samples: 1.10g/mL 1.11g/mL 1.09g/mL Average density: 1.10g/mL 1.10g/mL 1.10g/mL Deviation from Average: ±0.00g/mL ±0.01g/mL -0.01g/mL Average Deviation: add absolute values of deviations from average and divide by the number of trials.
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.
Part D: Density of Methanol 1) Find the mass of an empty 10 mL graduated cylinder, and then fill approximately 9 mL of methanol and record volume. 2) Find the mass of the cylinder and methanol, subtracting the initial mass from the new mass to determine the mass of methanol. 3) Determine the density and percent error. Data: Part A: Density of a Rectangular Solid/Cube Block # 9 (cube – brass) 1. Mass – 132.32g 2.
0.00512 * 500 = 2.56 c. 0.00806 * 319.9= 2.56 d. 0.00806 * 319.9 = 2.56 500 mL =0.5 L e. 0.0161 * 500 / 2 =2.56 4. Exercise 4: a. 0.250M; 250 mL 0.25 L (0.25) (0.25) = 0.0625 moles ZnI2 b. Prepare the solution by dissolving 19.95 grams of Zinc Iodide with 250 mL of water. c. Prepare the solution by dissolving 38.90 grams of ZnI2 with 500 mL of water.
1.7 — Submit the completed laboratory report via the Week3 Digital Dropbox by Sunday evening of Week3. Make sure your name is on the laboratory pdf document. Alternatively, you can submit the saved pdf file into the Desktop folder (lastname_iLab3) for later submission to your instructor with the Lab Manual exercises. LABORATORY STEPS PART B: Step 2: Lab Manual Exercise 26: Blood Components and Blood Tests ~ 1 hour From Allen and Harper, Laboratory Manual for Anatomy and Physiology 5th ed. 2.0 — Read background pages 411-423 from the Laboratory Manual.
There will have some error. 2) A volatile liquid was allowed to evaporate in a 43.298 g flask that has a total volume of 252 ml. the temperature of the water bath was 100˚C at the atmospheric pressure of 776 torr. The mass of the flask and condensed vapor was 44.173 g. calculate the molar mass of the liquid. T = 273 + 100 = 373 V = 252 mL = 1 L / 1000 mL = 0.252 L P = 776 Torr R= 0.0821 mass of 44.173 - 43.298 g = 0.875g moles of gas = PV / RT = 776 x .252 / 62.363 x (273+100) =0.00841 moles molar mass = 0.875g / 0.00841 moles = 104.1 g/
Name: Patrick Morefield Date: December 06, 2006 Lab Partner: Gabriel Rodriguez Unknown No. : 941 Report Sheet Colligative Properties: Freezing-Point Depression and Molar Mass |1. |Volume of cyclohexane |10..1mL | |2. |Mass of empty insulated test tube and spin bar |345.47g | | |Mass of stir bar, tube and cyclohexane |353.10g | | |Mass of cyclohexane |7.63g | |3. |Mass of insulated test tube, spin bar, cyclohexane and |353.25g | | |unknown | | |4.
What is the final pressure in the drum if the final temperature is 60oC? A. 0.055 MPa B. 2.0 MPa C. 10 MPa D. 55 MPa Problems 35 and 36 are based on the following statement. Ten kilograms of oxygen and 2 kg of hydrogen are mixed in a 1 m3 vessel.
Limiting Reactants Mini Lab Results: Data Table of Quantitative Observations: Test Tube Moles of NaI reacted Moles of Pb(NO3)2 Reacted Mass of Empty Tube Mass of Tube with PbI2 ppt. Mass of PbI2 ppt. 1 1.0 x10 -3 1.5 10 -4 7.58g 7.65g .07g 2 1.0 x10 -3 2.5 10 -4 8.33g 8.43g .10g 3 1.0 x10 -3 5.0 10 -4 8.19g 8.43g .24g 4 1.0 x10 -3 7.5 10 -4 6.72g 6.97g .25g 5 1.0 x10 -3 1.0 10 -3 8.98g 9.12g .23g Calculations: Moles of NaI reacted (for all tubes) Volume used/1 x 1L/1000mL x mol/1L 2.0mL/1 x 1L/1000mL x .5/1L = 1.0 x10-3 Moles Pb(NO3)2 Reacted Volume used/1 x 1L/1000mL x mol/1L Test Tube 1 .3mL/1 x 1L/1000mL x .5/1L = 1.5 x10-4 Test Tube 2 .5mL/1 x 1L/1000mL x .5/1L =2.5 x10-4 Test Tube 3 1.0mL/1
To clean up files on your hard drive: 1) Choose Start Control Panel System and Security. The Administrative Tools window appears.2) Click Defragment Your Hard Drive. The Disk Defragmenter dialog box appears.3) Click the Analyze Disk button. This step checks whether your disk requires defragmenting. A drive with 10 percent or more fragmentation should be defragmented.4) When the analysis is complete, click the Defragment Disk button.