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AP Biology/Unit 2: Cell Structure and Function
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Calculating Diffusion Efficiency

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The efficiency of a molecule’s diffusion can be approximated by the ratio Diffusion CoefficientMolecular Weight\frac{\text{Diffusion Coefficient}}{\text{Molecular Weight}}. Based on the data presented in the table, which of the following molecules has the highest diffusion efficiency?

Molecule Molecular Weight (g/mol) Diffusion Coefficient (10−5  cm2/s10^{-5} \;cm^2/s)
Oxygen 32 2.1
Glucose 180 0.7
Water 18 2.3
CO2 44 1.6
A

Glucose

B

Water

C

Oxygen

D

CO2

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