122pex1

# 122pex1 - 1 1 A scuba tank has a volume of 13.2 L What...

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1 1. A scuba tank has a volume of 13.2 L. What volume of air (in liters) at 722 torr is required to fill the tank to a pressure of 153 atm assuming no change in temperature? a) 2.13 x 10 3 b) 1.90 x 10 3 c) 1.82 x 10 3 d) 1.70 x 10 3 e) 1.52 x 10 3 2. Consider a cylinder fitted with a movable piston that can expand against the atmosphere. The initial pressure, volume and absolute temperature inside the cylinder are P i , V i and T i . What is the new temperature of the system when the pressure is doubled and the volume is decreased to one third of the original volume? a) (4/9) T i b) 6 T i c) (2/3) T i d) P i V i T i e) P i 2 V i 3 T i 3. What is the density (g/L) of pure oxygen gas at STP? (atomic weight: O = 16.00) a) 1.12 b) 1.24 c) 1.34 d) 1.43 e) 1.52

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2 4. A balloon holds 25.8 g of Cl 2 at 1.25 atm and 22 o C. A second balloon under the same conditions of temperature and pressure, has the same volume and holds 10.2 g of an unknown gas. What is the molecular weight of the unknown gas? (atomic weight: Cl = 35.453) a) 3.71 b) 28.0 c) 70.9 d) 142 e) 179 5. The empirical formula of a volatile liquid is C 2 H 4 O. A 0.345-gram sample of its vapor occupied 120 mL at 100°C and 1.00 atm. What is the molecular formula for the compound? (Atomic weights: H = 1.008, C = 12.01, O = 16.00) a) C 2 H 4 Ob ) C 3 H 6 O 2 c) C 4 H 8 O 2 d) C 6 H 12 O 3 e) C 8 H 16 O 4 6. A 10.0 L flask contains 0.115 moles O 2 , 0.325 moles CO 2 and 0.748 moles N 2 . The total pressure in the flask is 2.70 atm. What is the partial pressure (in atm) of O 2 ? a) 0.137 b) 0.261 c) 0.878 d) 1.16 e) 1.45
3 7. Five identical 1.0-L flasks contain the following gases each at 0°C and 1 atm pressure. The densities (g/L) of the gases are listed below. Which gas has the Smallest molar mass ? G a s 1G a s 2G a s 3G a s 4G a s 5 0.178 3.16 0.715 0.760 1.25 a) Gas 1 b) Gas 2 c) Gas 3 d) Gas 4 e) Gas 5 8. Recall the van der Waal’s equation and the significance of the constants a and b. Values of the van der Waal’s constants are determined for two gases and given in the table below. gas a (atm @ L/mol 2 ) b (L/mol) A 0.134 0.143 B 30.53 0.102 Which of the following statements, a-d , is NOT true? a) Ideal gases conform to the postulates of the Kinetic Molecular Theory and follow the Ideal Gas Law. b) Deviations from ideal behavior of gases are most likely at high pressures and low temperatures. c) Gas A has stronger intermolecular forces than gas B. d) The molecules of gas A are larger than the molecules of gas B. e) Pick this statement if All statements a-d are true. 9. Which gases, Ne, Cl 2 , H 2 S diffuse faster than N 2 under identical experimental conditions? (atomic weights: H = 1.008, N = 14.01, Ne = 20.2, S = 32.07, Cl = 35.45) a) Ne only b) Cl 2 only c) H 2 S only d) Cl 2 and H 2 S e) Ne, Cl 2 and H 2 S

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4 10. When the volume of 0.613 mole of a gas is decreased from 3.0 L to 20 mL, at a constant temperature of 298 K, its pressure changes from 5.0 to 1000 atm. What could cause this deviation from the expected ideal value? ( Hint : Calculate what the ideal pressure would be after changing the volume.)
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122pex1 - 1 1 A scuba tank has a volume of 13.2 L What...

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