Meeting%2013%20F%202010

# Meeting%2013%20F%202010 - Meeting 13 The ideal gas law PV =...

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1 Meeting 13 The ideal gas law: PV = nRT For calculations involving gases, we define a “standard state, STP”: P = 1 atm. T = 0 0 C = 273.15 K. Example : Calculate the molar volume of an ideal gas at STP. V = nRT/P = (1 mol)(0.08206 L •atm mol -1 K - 1 ) (273.15 K)/1 atm. V = 22.415 L ≈ 22.4L Vizualizing 22.4 L

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2 Applications of the ideal gas law include molecular mass and gas density determination. Molecular mass Text Problem : 10.550 g of a gas occupies 0.200 L at 289 K and 0.968 atm. Determine the molecular mass of the gas. PV = nRT mass is not in the equation. Hmmm. Maybe we Can find a way to get the molar mass via a second equation. n = m/M. Now M = (0.550)(0.0821)(289)/[(0.968)(0.200) M = 67.4 g mol -1 What could the gas be? PV mRT M or RT M m PV
3 ClO 2 , Chlorine dioxide is possible; M = 67.4 g mol -1 Chlorine dioxide gas kills dangerous biological contaminants The same sanitizing agent used to rid federal office buildings of anthrax – chlorine dioxide gas – can effectively eliminate deadly bacteria from apples and

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## This note was uploaded on 03/08/2011 for the course CHEM 161 taught by Professor Vacillian during the Fall '08 term at Rutgers.

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Meeting%2013%20F%202010 - Meeting 13 The ideal gas law PV =...

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