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Recitation Activity 2 Chemistry 122

Recitation Activity 2 Chemistry 122 - 4 The decomposition...

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Recitation Activity 2 Chemistry 122, Dr. Loza Week of Jan 14, 2008 1. Chemical analysis of a gaseous compound showed that it contained 33.0% Si and 67.0% F by mass. At 35.0 0 C, 0.210 L of the compound exerted a pressure of 1.70 atm. If the mass of 0.210 L of the compound was 2.38 g, calculate the molecular formula of the compound. 2. A chemist synthesized a greenish-yellow gaseous compound of chlorine and oxygen and finds that its density is 7.71 g/L at 36.0 0 C and 2.88 atm. Calculate the molar mass of the compounds and determine its molecular formula. 3. A mixture of gases contains 4.46 moles of neon, 0.74 argon and 2.15 moles of xenon. Calculate the partial pressure of the gases if the total pressure is 2.00 at a constant temperature.
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Unformatted text preview: 4. The decomposition of potassium chlorate generates 128 mL of oxygen gas at 24.0 C and 762 mm Hg. Calculate the grams of oxygen obtained. The vapor pressure of water vapor at 24.0 C is 22.4 mm Hg. 5. Calculate the root mean square speed (m/s) of helium atoms at 25.0 C. 6. A flammable gas made up of only carbon and hydrogen is found to effuse through a porous barrier at 1.50 min. Under the same conditions, it takes an equal volume of bromine vapor 4.73 min to effuse through the same barrier. Calculate the molar mass of the unknown gas. 7. Given that 3.50 moles of ammonia occupy 5.20 L at 47.0 C, calculate the pressure of a gas (atm) using (a) the ideal gas equation and (b) the van der Waals equation....
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