# chem4 - Experiment 5- The Molar Volume of Gases Pre Lab...

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Experiment 5- The Molar Volume of Gases Pre Lab Questions 1. Molar volume= molar mass/density= 17.034 (g/mol)/0.76(g/L)=22 mol/L. Therefore the units of molar volume are mol/L. 2. Molar volume= 31.999 (g/mol)/1.429 (g/L)=22.392 mol/L 3. 48.1 g CH4/16 (g/mol)= 3.01 mol V=(3.01)(.0821)(27)= 67.5 L 4. A) To determine mass and number of moles, find the molar mass and convert to moles. B) To determine the volume of oxygen produced, we can calculate the volume of O2 in L/mol. 5. P total is determined by adding P O2 and P H20 together. You must equalize the pressure inside and outside the flask to determine the total because it keeps the water level the same. 6. X-18.65 torr/ 19.827 torr-18.65= 21.6 degrees-21 degrees/22 degrees-21 degrees= 19.36 torr 7. 22.3 degrees C-22 degrees C/ 23 degrees C-22 degrees C= x-19.827 torr/21.068 torr- 19.827 torr= 20.199 torr 8. A) Determine the number of moles by looking at the equation and finding molar mass. B) To find the volume of hydrogen, take the molar mass and divide by density. Find The volume of H2 produced at known temperatures. 9. V2= V1(P1/P2)(T2/T1) V2=110 mL(750 torr/760 torr)(273 K/293 K) (108.55)(.93174)= V2=101 mL Introduction The purpose of the lab is to learn how to find the molar volume of gases. The lab is also how to measure the volumes of gases and calculating the molar volume of gases using the ideal gas law and the law of partial pressures. Data Part 1: 1. The first step is to clean the glassware with soap and water. 2. Then we had to set up the experiment as shown in the diagram in the book. We measured 20 mL of 3% solution in a graduated cylinder and poured it into a 250 mL Erlenmeyer flask. Then it was measured and pour approximately 4.5 mL of 3M FeCl3 in a test tube and it was lowered into a 250 mL Erlenmeyer flask.

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3. The next step involved filling a 500 mL Erlenmeyer flask to the neck with water and fill the 600 mL beaker about one-third full with tap water. Then air was forced into the
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## This note was uploaded on 09/30/2008 for the course CHEM 1A/1B taught by Professor Neuman during the Fall '06 term at UCSB.

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chem4 - Experiment 5- The Molar Volume of Gases Pre Lab...

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