1. 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. 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.5200 2.5300 3.5000 4.5700 5.5800

2. A box contains about 10.0 x 10 21 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. 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.61J 2.6.6J 3.5.8J 4.68J 5.64J

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 n V 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. 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.mgndy 2.mgn V dy 3.mgAdy 4.mgn V Ady 5.mgn V APdy

4. A container having a volume of 1.2 m 3 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 _____. (k B =1.38 x 10 -23 J/K. 0°C = 273.15 K) Select the correct answer. 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.7.3 x 10 -21 J 2.9.3 x 10 -22 J 3.8.9 x 10 -20 J 4.8.6 x 10 -21 J 5.8.4 x 10 -20 J

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. 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.240 K 2.250 K 3.30 K 4.270 K 5.170 K

6. The internal energy of n moles of an ideal gas depends on _____. Select the correct answer. 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.one state variable T 2.two state variables T and V 3.two state variables T and P 4.three state variables T, P and V 5.four variables R, T, P and V