Self Assessment A


1	A sample of gas occupies 2.78 x 10³ mL at 25 ^oC and 760 mm Hg. What volume with the gas sample occupy at the same temperature and 475 mm Hg?
		A)	0.130 L
		B)	1.04 L
		C)	1.74 L
		D)	4.45 L
		E)	None of the above.


2	A steel tank contains carbon dioxide at a pressure of 13.0 atm when the temperature is 34 ^oC. What will be the internal gas pressure when the tank and its contents are heated to 100 ^oC.
		A)	38.2 atm
		B)	9.40 atm
		C)	10.7 atm
		D)	15.8 atm
		E)	None of the above.


3	Calculate the density of nitrogen gas, in grams per liter, at STP.
		A)	0.625 g/L
		B)	0.800 g/L
		C)	1.25 g/L
		D)	2.50 g/L
		E)	None of the above.


4	A gas evolved during the fermentation of alcohol had a volume of 19.4 L at 17 ^oC and 746 mm Hg. How many moles of gas were collected?
		A)	0.80 mol
		B)	1.25 mol
		C)	10.5 mol
		D)	13.6 mol
		E)	608 mol


5	How many grams of carbon dioxide are contained in 550 mL of this gas at STP?
		A)	0.0245 g
		B)	0.0280 g
		C)	1080 g
		D)	0.560 g
		E)	1.08 g


6	A 1.325 g sample of an unknown vapor occupies 368 mL at 114 ^oC and 946 mm Hg. The empirical formula of the compound is NO₂. What is the molecular formula of the compound?
		A)	NO₂
		B)	N₄O₈
		C)	N₃O₆
		D)	N₂O₄
		E)	N₅O₁₀


7	An organic compound was analyzed and found to contain 55.8% C, 7.03% H, and 37.2% O. A 1.500 g sample of the compound was vaporized and found to occupy 530 cm³ at 100 ^oC and 740 torr. Which of the following is the correct molecular formula of the compound?
		A)	C₂H₃O
		B)	C₆H₄O₂
		C)	C₃H₂O
		D)	C₄H₆O₂
		E)	C₂H₃O₂


8	What volume of chlorine gas at 646 torr and 32 ^oC would be produced by the reaction of 14.75 g of MnO₂ according to the reaction: MnO₂(s) + 4 HCl(aq) ----> MnCl₂(aq) + Cl₂(g) + 2 H₂O(l)
		A)	5.00 L
		B)	0.170 L
		C)	2.33 L
		D)	0.200 L
		E)	None of the above.


9	A mixture of neon, argon, and xenon had a total pressure of 1560 mm Hg at 298 K. The mixture was found to contain 1.50 mol Ne, 2.65 mol Ar, and 1.75 mol Xe. What is the partial pressure of Xe?
		A)	701 mm Hg
		B)	658 mm Hg
		C)	396 mm Hg
		D)	463 mm Hg
		E)	None of the above.


10	Deviations from the ideal gas law are smaller at:
		A)	low temperatures and high pressures.
		B)	low temperatures and low pressures.
		C)	high temperatures and high pressures.
		D)	high temperatures and low pressures.

2002 McGraw-Hill Higher Education
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