Chapter 5 -lecture 3

Chapter 5 -lecture 3 - General Chemistry I Fall 2007 Joann...

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General Chemistry I Fall 2007 Joann S. Monko Chemistry 9th ed. Raymond Chang
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Alterations to PV = nRT Density (d) d = m = P M V RT m is the mass of the gas in grams M is the molar mass of the gas (g/mol) Molar Mass ( M ) M = dRT P d is the density of the gas (g/L) Chemistry, 8th ed. Chang 5th ed.
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USING GAS DENSITY USING GAS DENSITY The density of air at 15 The density of air at 15 o C and 1.00 atm is 1.23 C and 1.00 atm is 1.23 g/L. What is the molar mass of air? g/L. What is the molar mass of air? 1. Calc. moles of air. 1. Calc. moles of air. V = 1.00 L V = 1.00 L P = 1.00 atm P = 1.00 atm T = 288 K T = 288 K n = PV/RT = n = PV/RT = 0.0423 mol 0.0423 mol 0 5th ed.
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Clicker Question Calculate the density of CO 2 at STP. Record your answer to 2 decimal places (g/L).
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Dalton’s Law of Partial Pressures P 1 P 2 P total = P 1 + P 2 Chemistry, 8th ed. Chang Figure 5.14
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Da lto n’s  La w Da lto n’s  La w o f Pa rtia l Pre s s ure s o f Pa rtia l Pre s s ure s John Dalton John Dalton 1766-1844 1766-1844 The P of a mixture of gases is the sum of the partial pressures of the different gases. P total = P A + P B + P C +… Mole Fraction: X A = n A . n A + n B + n C Pressure of one gas: P A = X A (P total ) 5th ed.
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Dalton’s Law of Partial Pressures Dalton’s Law of Partial Pressures What is the total pressure in the flask? What is the total pressure in the flask?
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Chapter 5 -lecture 3 - General Chemistry I Fall 2007 Joann...

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