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?

Van der Waals constant 'b' for helium is 2.93 xx 10^(-5) m^(3) mol^(-1

1.	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?
Answer» SOLUTION :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 PI R^3` Radius of helium atom, `r = 1.3 xx 10^(-10) m`.