web quiz 4

web quiz 4 - Question # 1 A 3.31-g sample of lead nitrate,...

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Question # 1 A 3.31-g sample of lead nitrate, Pb(NO 3 ) 2 , molar mass = 331 g/mol, is heated in an evacuated cylinder with a volume of 1.62 L. The salt decomposes when heated, according to the equation 2Pb(NO 3 ) 2 ( s ) 2PbO( s ) + 4NO 2 ( g ) + O 2 ( g ) Assuming complete decomposition, what is the pressure in the cylinder after decomposition and cooling to a temperature of 300 K? Assume the PbO( s ) takes up negligible volume. A. 0.380 atm B. 0.228 atm C. 0.0342 atm D. 1.38 atm Question # 2 A mixture is prepared from 15.0 L of ammonia and 15.0 L chlorine measured at the same conditions. These compounds react according to the following equation: 2NH 3 ( g ) + 3Cl 2 ( g ) N 2 ( g ) + 6HCl( g ) When the reaction is completed, what is the volume of each gas (NH 3 , Cl 2 , N 2 , and HCl, respectively)? Assume the final volumes are measured under identical conditions. A. 0.00 L, 5.00 L, 7.50 L, 45.0 L B. 5.00 L, 0.00 L, 5.00 L, 30.0 L C. 0.00 L, 0.00 L, 7.50 L, 45.0 L D. 0.00 L, 0.00 L, 5.00 L, 30.0 L
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This note was uploaded on 10/25/2010 for the course CHEM 105ALg taught by Professor Bau during the Spring '07 term at USC.

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web quiz 4 - Question # 1 A 3.31-g sample of lead nitrate,...

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