The solubility of $CO_2$ is ________ times higher than that of $O_2$ across the diffusion membrane.
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Correct answer: 20-25
As the solubility of $CO_2$ is 20-25 times higher than that of $O_2$, the amount of $CO_2$ that can diffuse through the diffusion membrane per unit difference in partial pressure is much higher compared to that of $O_2$.
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