What would be the molality of 20\:^{o}/_{o}  (mass/mass) aqueous solution of KI?

( molar mass of KI =166\:g\:\:mol^{-1}  )

  • Option 1)

    1.08

  • Option 2)

    1.35

  • Option 3)

    1.48

  • Option 4)

    1.51

Answers (1)

 

Molality -

Molality (m) = (number of moles of solute)/(mass of solvent in kg)

 

- wherein

It is defined as the number of moles of solute present in 1 kg of solvent. It is denoted by m.

 

 

 

Mass percent of solution -

Mass percent = ((mass of solute)/(mass of solution) ) X 100

 

- wherein

 it is mass of solute present in 100 gram solution.

 

 

 

 

 

20\:^{o}/_{o} (mass/mass) = 20 gm is present in 100 gm solution .

solute is KI, weight =20 gm (given)

solvent weight is =  100 - 20 = 80 gm

\\mole\:\:of\:\:solute\:\:=\frac{20\:\:gm}{166\:\:gm/mole}=\frac{20}{166}moles \\\\\\\:molality =\frac{mole\:\:of \:\:solute\:\:(K.I.)}{weight\:\:of\:\:solvent(kg)}=\frac{20/166}{80\times10^{-3}}\\\\\\\:m=1.51\:\:mole/kg


Option 1)

1.08

Option 2)

1.35

Option 3)

1.48

Option 4)

1.51

Most Viewed Questions

Preparation Products

JEE Main Rank Booster 2022

Booster and Kadha Video Lectures, Unlimited Full Mock Test, Adaptive Time Table, 24x7 Doubt Chat Support,.

₹ 13999/- ₹ 9999/-
Buy Now
Knockout JEE Main 2022

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Live Classes(Classes will start from Last week of September), Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 34999/- ₹ 24999/-
Buy Now
Test Series JEE Main 2022

Chapter/Subject/Full Mock Tests for JEE Main, Personalized Performance Report, Weakness Sheet, Complete Answer Key,.

₹ 4999/-
Buy Now
Rank Booster JEE Main 2020

This course will help student to be better prepared and study in the right direction for JEE Main..

₹ 9999/- ₹ 2/-
Buy Now
Knockout JEE Main 2022

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Live Classes(Classes will start from Last week of September), Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 34999/- ₹ 24999/-
Buy Now
Boost your Preparation for JEE Main 2021 with Personlized Coaching
 
Exams
Articles
Questions