$15 \%$ aqueous solution of glucose (molecular weight $= 180 \ g/mol$) is isotonic with $8 \%$ aqueous solution containing an unknown non-dissociable solute. What is the molecular weight of the unknown solute?

  • A
    $108$
  • B
    $96$
  • C
    $84$
  • D
    $9.6$

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