$A$ $3\% \, w/v$ aqueous solution of urea is isotonic with a $5\% \, w/v$ aqueous solution of another solute. Assuming the van't Hoff factor for the solute is $1.0$,calculate the molar mass of the solute in $g/mol$.

  • A
    $50$
  • B
    $60$
  • C
    $90$
  • D
    $100$

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