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# 1988 AP - U.S National Chemistry Olympiad 1988 Local...

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U.S. National Chemistry Olympiad: 1988 Local Section Test Go to Answers 1. The recommended adult dose of Elixophyllin, a drug used to treat asthma, is 6.0 mg per kg of body weight. Calculate the dose, in milligram, for a 170-pound person. (A) 3.5 x 10¯ 2 mg (B) 460 mg (C) 1020 mg (D) 2250 mg 2. Expressed to the appropriate number of significant figures, the result of the calculation [(5.031-4.96)(2.38)] ÷ 3.91 (A) 0.04 (B) 0.043 (C) 0.0432 (D) 0.04322 3. Using the cathode-ray tube, J.J. Thompson was able to determine (A) the charge of an electron (B) the charge-to-mass ratio of an electron (C) the charge-to-mass ratio of a proton (D) that the nucleus of an atom is very small but contains most of the mass 4. The partial symbol for a particular ion is 24 Mg 2+ . The number of electrons contained is one of these ions is (A) 2 (B) 10 (C) 12 (D) 22 5. The mass percent of carbon in methanol, CH 3 OH, is (A) 12.0% (B) 12.5% (C) 16.7% (D) 37.5% 6. The correct molecular formula of a compound that has an empirical formula C 3 H 4 O and a molecular mass of 168 grams/mole is

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(A) C 3 H 4 O (B) C 6 H 8 O 2 (C) C 8 H 8 O 4 (D) C 9 H 12 O 3 7. A gas sample is contained in a flask connected to a U-shaped manometer. Measured from the bottom of the U-tube, the height of the mercury on the side connected to the flask is 62 mm. The height of the mercury on the side open to the atmosphere is 182 mm. The atmospheric pressure is measured with a barometer to be 759 mm Hg. The pressure of the gas in the container is (A) 120 mm Hg (B) 639 mm Hg (C) 821 mm Hg (D) 879 mm Hg 8. A sample of a gas with volume of 800 mL and pressure of 1.0 atm is transferred to a second container which has a volume of 250 mL and is at the same temperature. The pressure of the gas in the new container is (A) 0.31 atm (B) 1.0 atm (C) 1.5 atm (D) 3.2 atm 9. A 1.22 gram of an unknown volatile substance is vaporized at 100°C is 0.993 atm. The molecular weight of the substance is (A) 49.2 g/mol (B) 122 g/mol (C) 183 g/mol (D) 308 g/mol 10. Iron(III) oxide can be reduced with carbon monoxide to form metallic iron as described by the unbalanced chemical equation Fe 2 O 3 + CO ---> Fe + CO 2 The number of moles of CO required to form one mole of Fe from its oxide is (A) 1 (B) 1.5 (C) 2 (D) 3 11. A product of the reaction of silver nitrate, AgNO 3 , with calcium chromate, CaCrO 4 , in aqueous solution is
(A) CaNO 3 (B) Ag 2 NO 3 (C) AgCrO 4 (D) Ag 2 CrO 4 12. Sodium nitrate, heated in the presence of an excess of hydrogen, forms water according to the two-step process 2 NaNO 3 ---> 2 NaNO 2 + O 2 2 H 2 + O 2 ---> 2 H 2 O How many grams of sodium nitrate are required to form 9 grams of water? (A) 21.3

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1988 AP - U.S National Chemistry Olympiad 1988 Local...

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