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5200 5300 5000 5700 5800

Assume molecules have an average diameter of 1.20 x 10 -10 m. How many times larger is the mean free path than the diameter at STP? (Assume the pressure is 1.01 x 10 5 N/m 2 and the temperature is 20 ° C. 0 ° C = 273.15K) Select the correct answer. 5200 5300 5000 5700 5800.

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5200 5300 5000 5700 5800

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  1. 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. • 5200 • 5300 • 5000 • 5700 • 5800

  2. 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. • 61J • 6.6J • 5.8J • 68J • 64J

  3. 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. • mgndy • mgnVdy • mgAdy • mgnVAdy • mgnVAPdy

  4. 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. • 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

  5. 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. • 240 K • 250 K • 30 K • 270 K • 170 K

  6. The internal energy of n moles of an ideal gas depends on _____ . Select the correct answer. • 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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