EX3_FA03

# EX3_FA03 - CHEM 111 Constants: PracticeExam3 R = 0.082057...

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CHEM 111 Practice Exam 3 with Detailed Answer Key Constants: R = 0.082057 K mole atm L = 62.363 K mole L mmHg = 8.31451 mole K J 1 J = 1 Kg 2 2 s m h = 6.6256 x 10 - 34 J s c = 2.998 x 10 8 m/s Equations: 2 1 rate rate = 1 2 M M PV = nRT KE = 2 1 mv 2 v rms = M RT 3 E = q + w H reaction = Σ ( o f H products) - Σ ( o f H reactants) ν = c/ λ E = h ν w =-∆ (PV) Multiple choice. 4 pts. each . Partial credit may be given if some work or thought process is shown. 1. How many mL of H 2 would be required to completely react with 15.0 mL N 2 , if temperature and pressure are maintained constant, according to the equation for the reaction below? 3 H 2 (g) + N 2 (g) 2 NH 3 (g) a) 5 mL b) 10 mL c) 15 mL d) 30 mL e) 45 mL 2. An ideal gas is confined inside a flexible vessel. The initial temperature, pressure and volume are 34 o C, 1.15 atm and 7.28 L respectively. The temperature is then lowered to - 70 o C, and the pressure is raised to 2.75 atm. What is the final volume of the container, in L? a) 1.50 L b) 2.01 L c) 3.62 L d) 4.60 L e) 6.27 L 3. A ideal gas phase sample of an organic solvent has a density of 28.0 g/L at 100. K and 2.5 atm. What is the molar mass of the compound? a) 91.9 g/mol b) 144 g/mol c) 212 g/mol d) 574 g/mol e) 230 g/mol 4. A halothane-oxygen mixture (C 2 HBrClF 3 + O 2 ) can be used as an anaesthetic. A tank containing such a mixture has the following partial pressures: P(halothane) = 170 mm Hg P(O 2 ) = 570 mm Hg What is the mole fraction of halothane in the mixture? a) 0.23 b) 0.30 c) 0.70 d) 0.77 5. A photon of orange light has wavelength 514 nm. What is the energy of this photon? a) 3.86x10 - 19 J b) 5.14 x 10 - 7 J c) 2.32 x 10 5 J d) 5.83 x 10 14 J

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6. Consider the apparatus at the right. Two chambers are separated by a valve, and the initial conditions are given. When the valve between the flasks is opened and equilibrium is re-established, what is the partial pressure of CO 2 , if T is held constant? a) 92 torr b) 300 torr c) 600 torr Ne CO 2 d) 635 torr e) 692 torr f) 864 torr 50 mL 250 mL 550 torr 720 torr 7. How much energy (in joules) is required to melt a 5.00 g block of ice (initially at - 4.0 o C) to water at 10 o C? Use the values below for heat of phase changes and specific heats: C sp, ice = 2.09 J/g- o K; C sp, water = 4.18 J/g- o K; C sp, steam = 2.01 J/g- o K; H fusion = 334 J/g; H vap = 2256 J/g a) 585 J b) 1921.0 J c) 2108.9 J d) 7301.8 J 8. Calculate the v rms for UF 4 at 700 o C.
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## This note was uploaded on 01/05/2012 for the course CHEM 111 taught by Professor Lemaster during the Fall '08 term at Boise State.

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EX3_FA03 - CHEM 111 Constants: PracticeExam3 R = 0.082057...

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