Which of the following is true about diffusion constant (D) of O2 in air compare

Question

Which of the following is true about diffusion constant (D) of O2 in air compared to diffusion constant of O2 in water? O They are about the same (wihtin a factor of 2) O D in water is about 100 x smaller than in air O D in water is about 1000 times smaller than in air O D in water is about 10,000 x smaller than in air Submit Request Answer Part B Each O2 molecule collides about how many times per second in water? O 1000 times O 100,000 times O 106 times o 1010 times Submit Request Answer Part C Which of the following is true about temperature and diffusion constants? O Diffusion constants decrease as temperature increases. O Diffusion constants increase with temperature O Diffusion constants are independent of temperature.

Explanation / Answer

a) Option: d

diffusion coefficient, D = 10-6 to 10-5? m2?/sec -for gas

diffusion coefficient, D = 10-10 to 10-9? m2?/sec -for liquids

the ration of gas to liquid gives that for D is 10000 times smaller than gas.

b) Option: D

c) option: B

difusion coefficient is proportional to temperature.

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