The van der Waals coefficient a (expressed in atm · dm6 · mol−2 ) for four different gases are: He 0.0341; H2 0.242; Kr 5.125; O2 1.364. Based on the data given above, the gas that will be expected to have the lowest critical temperature Tc:

A. He.

B. H2 .

C. Kr.

D. O2

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