1. the self-diffusion coefficient of h2o molecules in water is 2.26 x 10-5 cm2 s-1 at 25 oc. estimate how long it takes for an h2o molecule in water to travel: a. 1.0 cm at 25 oc b. 2.0 cm at 25 oc c. 2.0 cm at 50 oc (this one will take some creativity…) hint: the argument in the error function relationship for fick's second law [x/(2*(dt)^.5] must be a constant since the error function is constant, therefore: x = k' 2 (dt)0.5 where x is the diffusion distance and t is time and d is the diffusion constant. we can just assume k' =1 which is not actually the case but at least can us get order of magnitude estimates for diffusion distances.

Explain the difference between each pair of concepts. a. frequency and relative frequency b. percentage and relative frequency a. select the correct choice below. a. frequency is the total number of observations in a data set. relative frequency is the number of times a particular distinct value occurs. b. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of a value to the total number of observations. c. frequency is the total number of observations in a data set. relative frequency is the ratio of the number of times a particular distinct value occurs to the frequency. d. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of two different values.