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Van der Waals constant 'b' for helium is...

Van der Waals constant 'b' for helium is `2.93 xx 10^(-5) m^(3) mol^(-1)`. Calculate actual volume of helium atom. What is the radius of helium atom?

Text Solution

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Excluded volume ` = b = 4 xx (V_(a) xx N_(0))`
Where `V_(a)` is the actual volume of helium atom.
`V_(a) = (b)/(4N_(0)) = (2.93 xx 10^(-5))/(4 xx 6.022 xx 10^(23)) = 1.02 xx 10^(-29) m^(3)`
Volume of helium atom ` = (4)/(3) pir^(3) = 1.02 xx 10^(-29) m^(3)`
Radius of helium atom, ` r = 1.3 xx 10^(-10)` m
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