Chem_340_Key_Quiz_1_Spring_2012

Chem_340_Key_Quiz_1_Spring_2012 - CHEM 340: Physical...

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CHEM 340: Physical Chemistry for Biochemists I, Spring 2012 January 20, 2012 Quiz 1 Print Your Name:_______ KEY _________________________________ 1. A mixture of 2.50 × 10 –3 g of O 2 , 3.51 × 10 –3 mol of N 2 , and 4.67 × 10 20 molecules of CO is placed into a vessel of volume 3.50 L at 5.20°C. a) Calculate the total pressure in the vessel. The pressure in the vessel can be calculated by using the total number of moles: () mol 10 7.8125 mol g 32.0 g 10 2.5 O n 5 1 - -3 2 × = × = mol 10 7.7547 mol molecules 10 6.02214 molecules 10 4.67 CO n 4 1 - 23 20 × = × × = ( ) bar 0.00288 Pa 2885.375 m 0.0035 K 278.35 mol K J 8.314472 10 3.51 mol 10 7.7547 mol 10 7.8125 V T R n p 3 1 1 3 4 5 tot = = × × × + × + × = = b) Calculate the mole fractions and partial pressures of each gas. The mole fractions, tot i i n n x = , and partial pressures, p n p i i × = , for the gases are: 0.0179 mol 10 4.3636 mol 10 7.8125 O x 3 5 2 = × × = ( ) bar 10 5.16 0.0179 bar 0.00288 O p 4 2 × = × = 0.8044 mol 10 4.3636 mol 10 3.51 N x 3 3 2 = × × = ( ) bar 10 2.32 0.8044
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This note was uploaded on 04/07/2012 for the course CHEM 340 taught by Professor Staff during the Spring '08 term at Ill. Chicago.

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Chem_340_Key_Quiz_1_Spring_2012 - CHEM 340: Physical...

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