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# Assuming the radius of diatomic molecules is approximately 1.0*10^-10m for what pressure will the mean free path in room-temperature (20C) nitrogen

Assuming the radius of diatomic molecules is approximately 1.0*10^-10m for what pressure will the mean free path in room-temperature (20°C) nitrogen be 4.6 m?

a. 1.5 × 10-7 atm

b. 4.9 × 10-8 atm

c. 6.9 × 10-8 atm

d. 2.2 × 10-7 atm

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q2)
0.20 g of hydrogen gas are held in a rigid container. The temperature of the gas is changed from 50 k to 80k How much heat is needed?

a. 25 J

b. 50 J

c. 75 J

d. 37 J

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q3)
A 24.0 kg sample of ice is at 0.00°C. How much heat is needed to melt it? (For water Lf=334 kj/kg and Lv=22257 kj/kg)

a. 8.02 × 103 kJ

b. 5.42 × 104 kJ

c. 0.00 kJ

d. 2.19 × 106 kJ

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q4)
Parcels of air rising in the earth's atmosphere cool as they rise due to their expansion in the lower pressures at higher altitudes. Rising dry air cools at a rate of about 1°C per 100 meters of altitude, a parameter called the lapse rate. As moist air rises and cools, some of its moisture condenses into liquid water. We would thus expect the lapse rate for moist air to be, in general:

a. less than 1°C per 100 m of altitude

b. greater than 1°C per 100 m of altitude

c. 1°C per 100 m of altitude

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