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Question:

A gas at 350K and 15 bar has molar volume 20?

Z<1 and repulsive forces are dominant

Z>1 and attractive forces are dominant

Z>1 and repulsive forces are dominant

Z<1 and attractive forces are dominant

Solution:

Correct option is C. Z<1 and attractive forces are dominant. Compressibility factor (Z) = Vreal/Videal ≈ Vreal < Videal; Hence Z < 1 ⇒ If Z < 1, attractive forces are dominant among gaseous molecules and liquefaction of gas will be easy. Option C is correct.