1. The problem statement, all variables and given/known data A student working 3.0 m away from you in the chemistry lab creates a bad odour. The odour takes a while to get to you (assume that air currents are negligible). You then move 2.0 m further away, but the odour catches up with you in another 60 seconds. What is the diffusion coefficient of the molecules you smell? hint: the root mean square distancee and the time must be measured from the source of the diffusing molecule. 2. Relevant equations t= R^2 / 6D 3. The attempt at a solution I first tried to find time from 0-3m by using the ratio between the two distances 2^2 / 6*s X 6T/^3 = 1 (1 since D is the same) I found that t = 135s I then added 135 to 60 seconds and used that as my total time and 5 as my total R and solved for D D = R^2 / 6*T = 25 / 6*195 =0.02136 However, my textbook says the answer is 0.044 and I don't see what I am doing wrong. :( Any help will be much appreciated, thank you!