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The specific heat of one mole of an ideal diatomic gas at constant

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The specific heat of one mole of an ideal diatomic gas at constant Powered By Docstoc
					Assume molecules have an average diameter of 1.20 x 10-10m. How many times larger is the mean free path than the diameter at STP? (Assume the pressure is 1.01 x 105N/m2 and the temperature is 20°C. 0°C = 273.15K) Select the correct answer.

1. 2. 3. 4. 5.

5200 5300 5000 5700 5800

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18 38

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20 40

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A box contains about 10.0 x 1021 hydrogen atoms at room temperature (21°C). Determine the thermal energy of these atoms. (R = 8.315J/mol·K. 0°C = 273.15K) Select the correct answer.

1. 2. 3. 4. 5.

61J 6.6J 5.8J 68J 64J

20% 20% 20% 20% 20%

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13 33

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17 37

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20 40

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When we consider a thin horizontal layer of the atmosphere, of thickness dy, of area A, with pressure P on the bottom, with an average mass m per molecule, and nV molecules per unit volume, the magnitude of the difference of the pressure at the top and bottom of the layer is given by dP = _____ . Select the correct answer.

1. 2. 3. 4. 5.

mgndy mgnVdy mgAdy mgnVAdy mgnVAPdy

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13 33

14 34

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15 35

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17 37

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20 40

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A container having a volume of 1.2 m3 holds 2.0 moles of helium gas at 80°C. If the helium behaves like an ideal gas, the average kinetic energy per molecule is _____ . (kB =1.38 x 10-23 J/K. 0°C = 273.15 K) Select the correct answer.

1. 2. 3. 4. 5.

7.3 x 10-21J 9.3 x 10-22J 8.9 x 10-20J 8.6 x 10-21J 8.4 x 10-20J

20% 20% 20% 20% 20%

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13 33

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17 37

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20 40

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Assume 4.0 moles of a diatomic gas has an internal energy of 20 kJ. Determine the temperature of the gas after it has reached equilibrium. (R = 8.315J/mol·K) Select the correct answer.

1. 2. 3. 4. 5.

240 K 250 K 30 K 270 K 170 K

20% 20% 20% 20% 20%

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13 33

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20 40

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The internal energy of n moles of an ideal gas depends on _____ . Select the correct answer.
1. 2. 3. 4. 5. one state variable T two state variables T and V two state variables T and P three state variables T, P and V four variables R, T, P and V
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13 33

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15 35

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17 37

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18 38

19 39

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20 40

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