3. An impure sample of K₂O was analyzed by precipitating the potassium as theinsoluble tetraphenyl borate salt, KB(C₆H₅)_4. The precipitate, KB(C₆H₅)₄ has amass of 3.14 g. What is the mass of K₂O in the original sample? (Molar masses:KB(C₆H₅)₄ = 358.3 g and K₂O = 94.2 g) (3%)
(A) 0.413 g
(B) 0.826 g
(C) 1.651 g
(D) 2.423 g
(E) None of the above

4. Infrared spectroscopy is useful for determining certain aspects of the structure oforganic molecules because (3%)(A) all molecular bonds absorb IR radiation.(B) IR peak intensities are related to atomic number and molecular mass.(C) most organic functional groups absorb in a characteristic region of the IRspectrum.(D) vibrational transitions are correlated to spin-spin coupling.(E) all of the above.

5. A constant current of 0.800 A is used to deposit copper at the cathode of anelectrolytic cell. How many coulombs would be required to reduce 2 mol of Cu2+ tometallic copper? (F = 96,500 coulombs/mol) (3%)(A) 2 (B) 48,250 (C) 96,500 (D) 193,000 (E) 386,000

6. What is the dominant form of triprotic acid at a pH of 6.50? (pKa1=1.99, pKa2=3.85,pKa3=9.89) (3%)(A) H2A- (B) HA2-(C) A3- (D) HA2- and H2A- are equal(E) A3- and HA2- are equal

7. What is the molar concentration of HNO3 (63.0 g/mol) in a solution that has aspecific gravity of 1.42 and is 70.5% HNO3 (w/w). (3%)(A) 11.2 M (B) 1.49 M(C) 0.79 M (D) 15.9 M(E) None of the above.

1. Economic booms should stimulate investment spending becauseduring booms:(A) the real interest rate increases.(B) corporate tax rates usually increase.(C) the purchase price of capital increases.(D) higher levels of employment increase the marginal product ofcapital.

2. In Irving Fisher's two-period model, if consumption in bothperiods is a normal good, then an increase in income in periodtwo:(A) increases consumption in period one only.(B) increases consumption in period two only.(C) increases consumption in both periods.(D) does not increase consumption in either period.

3. According to the Mundell-Fleming model for a small openeconomy with flexible exchange rates, if the governmentdecreases the money supply, then in the new short-runequilibrium:(A) income falls and the exchange rate rises.(B) the exchange rate falls and income rises.(C) ncome remains unchanged but the exchange rate rises.(D) the exchange rate remains unchanged but income falls.

4. In the Mundell-Fleming model with fixed exchange rates, attemptsby the central bank to decrease the money supply:(A) lead to a lower equilibrium level of income.(B) lead to a higher equilibrium level of income.(C) must be abandoned in order to maintain the fixed exchangerate.(D) must be offset by expansionary fiscal policy.

5. Over the past year, output grew 4%, capital grew 2%, and laborgrew 1%. If theincome shares of output with respect to capital and labor are 0.3and 0.7, respectively, how much did total factor productivity grow?(A) 2.0% (B) 2.7%(C) 3.0% (D) 3.3%

6. According to the Solow model, an increase in the capital-laborratio will(A) always reduce steady state consumption per worker.(B) always increase steady state consumption per worker.(C) reduce steady state consumption per worker if the capital-labor ratio is below the Golden rule capital stock.(D) increase steady state consumption per worker if the capital-labor ratio is below the Golden rule capital stock.

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