Email
Chat with tutor
logo

Ask Questions, Get Answers

X
 
Questions  >>  CBSE XII  >>  Chemistry  >>  Solutions
Answer
Comment
Share
Q)

A solution containing,8g of a substance in 100g of diethyl ether boils at $36.86^{\large\circ}C$,whereas pure ether boils at $35.60^{\large\circ}C$.Determine the molecular mass of the solute.(For ether $K_b=2.02kg mol^{-1})$

$\begin{array}{1 1}128.25gmol^{-1}\\138.25gmol^{-1}\\148.25gmol^{-1}\\168.25gmol^{-1}\end{array} $

1 Answer

Comment
A)
We have,
Mass of solute $W_2=8g$
Mass of solvent,$W_1=100g$
Elevation of boiling point,$\Delta T_b=36.86-35.60$
$\Rightarrow 1.26^{\large\circ}C$
$K_b=2.02$
Molecular mass of solute $M_2=\large\frac{1000\times W_2\times K_b}{\Delta T_b\times W_1}$
$\Rightarrow \large\frac{1000\times 8\times 2.02}{1.26\times 100}$
$\Rightarrow \large\frac{161.6}{1.26}$
$\Rightarrow 128.25 g mol^{-1}$
Help Clay6 to be free
Clay6 needs your help to survive. We have roughly 7 lakh students visiting us monthly. We want to keep our services free and improve with prompt help and advanced solutions by adding more teachers and infrastructure.

A small donation from you will help us reach that goal faster. Talk to your parents, teachers and school and spread the word about clay6. You can pay online or send a cheque.

Thanks for your support.
Continue
Please choose your payment mode to continue
Home Ask Homework Questions
Your payment for is successful.
Continue
Clay6 tutors use Telegram* chat app to help students with their questions and doubts.
Do you have the Telegram chat app installed?
Already installed Install now
*Telegram is a chat app like WhatsApp / Facebook Messenger / Skype.
...