8.0 Points Question 25 of 26 Methylene chloride is a common ingredient of paint

Question

8.0 Points Question 25 of 26 Methylene chloride is a common ingredient of paint removers. Besides being an irritant, it also may be absorbed through skin. Thus when using the paint remover, protective gloves should be worn. If 0.075 cm thick butyl rubber gloves are used, what is the breakthrough time, i.e. how long could the gloves be used before methylene chloride reaches the hang? The diffusion coefficient of methylene chloride in butyl rubber is 110 x 10A-8 cms. Round the answer, in min, to 3 significant figures in the following format: 12.3

Explanation / Answer

diffusion coefficient of CH2Cl2 = 110*10^-8 cm/s

diffusion coefficient(k) = d/t

   t = time taken = d/k

       = 0.075/(110*10^-8)

       = 68181.8 sec

       = 1.14*10^3 min

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