Molar.Volume.Gas.novp.student

# Molar.Volume.Gas.novp.student - Molar volume lab vnovp2...

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Molar volume lab vnovp2 Chemistry, Dr. Breinan p. 1 The Molar Volume of a Gas Equal volumes of all gases, measured at the same temperature and pressure, contain equal numbers of particles. This assumption was proposed by Amadeo Avogadro, an Italian chemist, in 1811. This statement also means that if you have the same number of particles of any gas at the same temperature and pressure, the volume should always be the same. What is the volume occupied by one mole of gas particles? Because the volume occupied by a mole of gas depends on the temperature and pressure of the gas, we must choose a standard temperature and pressure (STP): 273 K and 1 atm. The volume one mole of a gas occupies at STP is the standard molar volume . It should be the same for any ideal gas. In this laboratory exercise, you will determine the standard molar volume of a gas. You will react a known mass of magnesium metal with an excess of hydrochloric acid and collect the generated hydrogen gas in a gas-collection tube. The evolved gas will rise to the top of the water-filled tube, displacing an equal volume of water. A series of calculations will be used to find the standard molar volume. .. read the calculation section and sample calculation (if given) before doing the lab. An important application of this idea is credited to Stanislao Cannizzaro, another Italian chemist who came upon Avogadro’s hypothesis nearly 50 years after it had been proposed. He saw that this hypothesis pointed a way to finding the molar masses of gaseous elements and compounds. If equal volumes of gases contain equal numbers of particles, then the masses of those gas volumes should be in the same ratio as the masses of their constituent particles. These findings were instrumental in Mendeleev’s work in organizing the periodic table in the middle 1800’s. Objective 1. To calculate the standard molar volume of hydrogen gas (without using the ideal gas constant!) SAFETY : - Wear goggles gloves, and aprons - The 6M HCl is very corrosive and cause severe burns or eye damage. Be extremely careful in pouring the acid into the gas collection tube. ..pour over the sink and use only a small container. Bring the gas collection tube to the lowest level you can so you do not pour above someone’s head, face, or exposed skin. - Be careful with the gas collection tubes. They are expensive and can cut you if broken. Carry them securely and do not allow them to roll off the lab bench. Materials gas-collection tube 1-hole rubber stopper beaker (400-mL) magnesium ribbon copper wire ruler Shared materials: thermometer barometer large graduated cylinder 6M HCl Prelab Complete on a separate sheet. 1. Prepare a data table for this lab.

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## This note was uploaded on 03/06/2011 for the course CHEM 444 taught by Professor Finn during the Spring '11 term at Chapman University .

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Molar.Volume.Gas.novp.student - Molar volume lab vnovp2...

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