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1. Solution and colligative properties — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry1. Solution and colligative properties1 Mark
MCQ
What is the mole fraction of the solute in $2.5\,m$ aqueous solution 
  • ✓
    $0.04$
  • B
    $0.08$
  • C
    $0.43$
  • D
    $0.25$
✓

Answer

Correct option: A.
$0.04$
a
$\Rightarrow$ moles of solute $=2.5$

moles of water $=1000 / 18=55.55$

$(1000 / H_2 O$ as water has 18$)$

so mole fraction $=2.5 /(2.5+55.55)$

$=($ moles of solute/ moles of solute $+$ solvent $)$

$=0.043($ approx $)$

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