The vapor pressure of a pure liquid solvent $(X)$ decreases from $0.80 \ atm$ to $0.60 \ atm$ upon the addition of a non-volatile solute $(Y)$. What is the mole fraction of $(Y)$ in the solution?

  • A
    $0.20$
  • B
    $0.25$
  • C
    $0.50$
  • D
    $0.75$

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