7. In a Knudsen Cell experiment, the rate of effusion of a gas through a small o

Question

7. In a Knudsen Cell experiment, the rate of effusion of a gas through a small orifice is used to determine the vapor pressure of the gas. Since the rate of effusion is proportional to the frequency of collisions with the wall (Z), a substance with a high vapor pressure will have effusion rate compared to a substance with a lower vapor pressure, all other variables being equal. a. a lower b. a higher c, the same d. a different, but unpredictable 8. In an isochoric (constant volume) process, is zero. a. C. 9. For a single component system at the triple point, there are degrees of freedom. a. b. 1 c. 0 d.-1 10. }{--and --in an isobaric (constant pressure) reversible expansion of an ideal gas. a. q,0 b. 0, (nR/p)AT 11. In an isothermal, reversible expansion of an ideal gas b. w .-nRT In(VJV.) and q = nRT In(VJV.) d. All of these

Explanation / Answer

q8

isochoric implies zero chang ein volume, therefore, 0 work, by definition, since no movement

q9

if isobaric, then

Q = dH

dV = nR/(p) * dT

Q11

if isothermal,

dH and U = 0, since state function of T

if expansion of V, there is Work, function of natural log

therefore, entropy cna be modelled as well with the entropychange

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