The diagram below shows some isotherms of water. (a) Estimate values for the critical constants and the van der Waals constants a and b for this gas. (b) Using the information from part (a), estimate the radius of a water molecule. Compare to the value of 1.37 A obtained from interpolation of ionic radii (Y. Zhang and Z. Xu, American Mineralogist 80 (1995) 670-675). XX

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