SP 09 Final Exam - CHM 2045 Final Exam Spring 2009 Form...

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CHM 2045 Final Exam Spring 2009 Form Code A Instructions: On your scantron enter and bubble in your name , UF ID number , and Form Code (see above). Careful! Bubbling errors will not be negotiated . 1. A sample of zinc metal reacts completely with an excess of hydrochloric acid: Mn(s) + 2HCl(aq) → MnCl 2( aq) + H 2 (g) The hydrogen gas produced is collected over water at 25.0ºC. The volume of the gas is 7.80 L, and the pressure is 0.980 atm. Calculate the mass (g) of manganese metal consumed in the reaction. (Vapor pressure of water at 25ºC = 23.8 mmHg.) (1) 4.6 g Mn (2) 16.6 g Mn (3) 19.8 g Mn (4) 21.7 g Mn (5) 24.6 g Mn 2. The boiling point of a glucose solution (d = 1.16 g/mL) is 100.21 ºC. Calculate the osmotic pressure of that solution at 298K. (glucose = 180.2 g/mol ; k fp for water = 1.86 o C/m ; k bp for water = 0.520 o C/m) (1) 9.4 atm (2) 10.5 atm (3) 157 atm (4) 2.99 atm (5) 31.6 atm 3. What is the strongest intermolecular force that exists between SO 2 and I 2 ? (1) dipole-dipole (2) ion-dipole (3) London dispersion (4) dipole-induced dipole (5) ion-induced dipole 4. The solubility of NH 4 Cl at 20°C = 37g per 100 g H 2 O. If a solution is prepared by dissolving 95 g of NH 4 Cl in 200.0 g H 2 O at 60°C, what mass of NH 4 Cl will recrystallize when the solution is cooled to 20°C? (1) 21 g (2) 58 g (3) 37 g (4) 74 g (5) 48 g 5. Copper crystallizes in a face-centered cubic unit cell, and copper has an atomic radius of 128 pm. What is the density of copper? (1) 1.35 g/cm 3 (2) 2.71 g/cm 3 (3) 4.98 g/cm 3 (4) 7.66 g/cm 3 (5) 8.90 g/cm 3 6. Arrange NH 3 , PH 3 , and CH 4 in order from lowest to highest boiling point. (1) PH 3 < CH 4 < NH 3 (2) NH 3 < CH 4 < PH 3 (3) CH 4 < NH 3 < PH 3 (4) PH 3 < NH 3 < CH 4 (5) CH 4 < PH 3 < NH 3 7. Predict the formula of a tellurium-fluorine molecule (or ion) with a square pyramidal molecular geometry. (1)
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SP 09 Final Exam - CHM 2045 Final Exam Spring 2009 Form...

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