Quiz 3 Key - 0.500 mol NH 4 NO 3 creates 3(0.500 mol = 1.500 mol gas p TOT = nRT V =(1.500 mol(0.0821(475 K(15.00 L = 3.90 atm Ans 3.90 atm(3(2 pts

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CHEMISTRY 201X: Quiz #3 September 7, 2007 Name: _______KEY________________________ INFORMATION : pV = nRT p 1 = x 1 p TOT R = 0.0821 L atm/mol K FW(NH 4 NO 3 ) = 80.0 g/mol FW(N 2 O) = 44.0 g/mol FW(H 2 O) = 18.0 g/mol Ammonium nitrate, NH 4 NO 3 (s), when heated to 475 K, decomposes in nitrous oxide, N 2 O(g), and water vapor, H 2 O(g). (1) (3 pts) Balance the chemical equation for this decomposition process. __ 1 ___ NH 4 NO 3 (s) ⎯→ __ 1 ___ N 2 O(g) + __ 2 ___ H 2 O(g) (2) (3 pts) 40.00 g NH 4 NO 3 (s) is placed into a 15.00 L solid, closed container that is heated to 475 K. What is the total pressure (in atm) of the gas mixture once all the ammonium nitrate has decomposed? (If you are unsure of your answer to (1), you may ask your TA for the answer.) 40.00 g / 80.00 g/mol = 0.500 mol
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Unformatted text preview: 0.500 mol NH 4 NO 3 creates 3(0.500 mol) = 1.500 mol gas p TOT = nRT / V = (1.500 mol)(0.0821)(475 K)/(15.00 L) = 3.90 atm Ans. ___ 3.90 atm ____ (3) (2 pts) What is the partial pressure of N 2 O(g) in the 15.00 L container at 475 K once the reaction is completed? (If you have no answer to (2), you may use p TOT = 4.00 atm.) x (N 2 O) = 1/3 = 0.333 p (N 2 O) = x (N 2 O) p TOT = (0.333)(3.90 atm) = 1.30 atm Ans. ____ 1.30 atm _____ (4) (2 pts) On the following graph, the Maxwell-Boltzmann distribution for H 2 O(g) at 475 K is shown. Draw the Maxwell-Boltzmann distribution curve for N 2 O(g) at the same temperature. Speed Relative Probability N 2 O H 2 O...
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This homework help was uploaded on 03/27/2008 for the course CHEM 201 taught by Professor Miller during the Fall '07 term at Iowa State.

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