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Question

Van der waals constant "b" of helium is 24 mL mol1. Find molecular diameter of helium.


A

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B

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C

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D

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Solution

The correct option is C


b = 4 × volume occupied by molecules of 1 mole of a gas ,

or b = 4NA43πr3

or r = 3b16NAπ

= 3×2416×6.023×1023×3.1413 cm

= 1.355 ×108 cm.


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