Q.

The van der Waals’ constant ‘b’ of  a glass is 4π×104L/mol. The centers of the two molecules approach each other? [Use:NA=6×1023]  by 10n  then  n  is______

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answer is 10.

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Detailed Solution

b=4×43×πr3×NA;4×π×104×1000=4×43×π×r3×6×1023,r=5×109  cm

Distance of closest approach =2r

108  cm             or  1010m

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The van der Waals’ constant ‘b’ of  a glass is 4π×10−4L/mol. The centers of the two molecules approach each other? [Use:NA=6×1023]  by 10−n  then  n  is______