0

Guest

Courses New

A 100 cm cube solution of sodium carbonate is prepared by dissolving 8.653g of the sail in water. The density of solution is 1.0816 pee millilitres. What are the molarity and molality of the solution.

A 100 cm cube solution of sodium carbonate is prepared by dissolving 8.653g of the sail in water. The density of solution is 1.0816 pee millilitres. What are the molarity and molality of the solution.

Grade:12

3 Answers

Arun
25750 Points
6 years ago
Dear Akash

Density = mass / volume ;
1.0816 = mass / 100 ;  mass=108.16
mass of solvent = 108.16 - 8.653 = 99.507
Molar mass of sodium carbonate = 23 + 12 + 3*16 = 83
no. of moles of sodium carbonate = (given mass) / molar mass=8.653 / 83 = 0.104
molality = ( no. of moles ) / ( mass of solvent ) = ( 0.104 / 99.507 ) * 1000 = 1.0451
molarity = ( no. of moles ) / ( volume of solution ) = ( 0.104 / 100 ) * 1000=1.04
 
Regards
Arun (askIITians forum expert)
Mahesh
13 Points
3 years ago
Bhai aap ko sodium carbonate ka formula bhi nahii ataa. Aap Akash ka naam kharab kar rahe hooo.
 
Molar mass Na2 CO3 = 23x2 + 12+ 16x3
                                       = 46 + 12+48
                                        = 106g/mol
Aditya singh
15 Points
2 years ago
D=m/v 
1.0816=m/100, m=1.0816×100=108.16g
Mass of solvent =108.16-8.653= 99.507
No.of moles of solute = 8.653/106=0.0816
M=no.of moles of solute/volume of solution in l
M =0.0816mol×1000/100cm3= 0.816M
Molality(m)=no.of moles of solute /mass of solvent inkg 
m= 0.0816 mol×1000/99.507g= 0.820m

Think You Can Provide A Better Answer ?

Other Related Questions on Physical Chemistry

View all Questions »

ASK QUESTION

Get your questions answered by the expert for free

Answer and earn gift vouchers

Win Gift vouchers upto Rs 500/-

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Click Here Know More

Complete Self Study Package designed by Industry Leading Experts

Click Here Know More

Live 1-1 coding classes to unleash the Creator in your Child

Click Here Know More

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Click Here Know More