What does the value of a in van der waals equation
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The value of 'a' depends on pressure and volume
a= ( pressure × volume^2) ÷ mole^2
It's unit is atmL^2/mol^2 or Nm^4/mol^2 or atm dm^6/mol^2
The van der Waals equation of state approaches the ideal gas law PV=nRT as the values of these constants approach zero.
The constant "a"provides a correction for the intermolecular forces.
Hope you understand
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