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# Chap 12 practice problems answers - EXAM PRACTICE QUESTIONS...

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EXAM PRACTICE QUESTIONS Chapter 12 1. If the volume of a sample of neon is tripled while its Kelvin temperature is quadrupled, what is the affect on the pressure of the gas? If volume is 3V, then the pressure is reduced to 1/3 P (Boyle's Law). If temperature is 4 K, then the new pressure is 4 P (Gay Lusacc's Law). This is a combined gas law problem. 1/3 P × 4 P = 4/3 P, or the net affect on the pressure is an increase by a factor of 1.33. 2. The simplest formula for a compounds is NO 2 . If 46.0 grams of the gas occupies 11.2 L at STP, the mass of one mole of the compound is ______. The mass of one mole is the same as the MW of the compound. g/mol 92.0 = MW L) (11.2 atm) (1.00 K) )(273 K mol atm L g)(0.0821 (46.0 = MW PV gRT = MW MW gRT = PV 3. The volume of a sample of gas is 405 mL at 10.0 atm and 467 K. What volume will it occupy at 4.29 atm and the same temperature? This is a Boyle's Law problem, P 1 V 1 = P 2 V 2 . mL 944 = V atm 4.29 atm) (10.0 mL) (405 = P V P = V 2 2 1 1 2 4. If 5.50 L of argon gas at 273 ° C is heated at constant pressure to a temperature of 546 ° C, what would be its new volume? This is a Charles' Law problem. L 8.25 = K) (546 K) )( L (5.50 = V T T V = V T V = T V 2 1 2 1 2 2 2 1 1 819

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5. A sample of helium occupies 1.40 L at standard conditions. What pressure will it exert in a 5.00 L vessel at 100.
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