Suppose an average molecule's displacement is 1.2 m in one hour. What is the diffusion constant in SI units (m, kg, s). A) 4.0 *10 ^- ⁴ SI units B) 1.0 *10 ^- ⁴ SI units C) 2.8 *10 ^- ⁵ SI units D) 4.6 *10 ^- ⁸ SI units

Question

Quizplus · Accepted Answer

The diffusion constant is given by the formula D = /2t, where is the mean square displacement and t is the time. In this case, = (1.2 m)^2 = 1.44 m^2 and t = 1 hour = 3600 s. Therefore, D = 1.44 m^2 / (2 * 3600 s) = 2.0 x 10^-4 m^2/s.

Suppose an Average Molecule's Displacement Is 1