5 marksh

An aqueous solution of 2% non-volatile solute exerts a pressure of 1.004 bar at the normal boiling point of the solvent. What is the molar mass of the solute?

Answer

Here,

Vapour pressure of the solution at normal boiling point (p1) = 1.004 bar  (Given)

Vapour pressure of pure water at normal boiling point (p10) = 1.013 bar

Mass of solute, (w2) = 2 g

Mass of solvent (water), (w1) = 100 – 2 = 98 g

Molar mass of solvent (water), (M1) = 18 g mol - 1

According to Raoult’s law,

(p10 - p1p10    =

Read More

Untitled 1

Stage 3Stage 3Stage 3 

An aqueous solution of 2% non-volatile solute exerts a pressure of 1.004 bar at the normal boiling point of the solvent. What is the molar mass of the solute?
Solution :
 Given values
Concentration is given in percent so that take
mass of the solution = 100 g
mass of non-volatile solute = 2% = 2g mass of the solvent = (100 — 2) = 98 g molecular mass of solvent (water) = 18
We have to find molecular mass of solute
The vapour pressure of pure boiling water = 1atm = 1.013
Read More

ingles

1º-Complete the sentences with: (Complete with the word or the num
1-I’m not buying it ……………….1..because……………………..it’s too expensive
2-I was lost……………3…so………………………….. I bought a street map
3-We couldn’t get into the factory ……………4…because of………………………….the 
4-They’ve got………2 such……….a lot of money, they don’t know what to do 
5-She didn’t get the job ……4….because of……………
Read More

chem

Write your tex

Substances can exist in each of these three states:

– solid

– liquid

– gas

• depending on the temperature and pressure.


The solid state

• Solids have:
• definite shape and definite volume • high density
• small compressibility
• very small thermal expansion

• Solid molecules are packed closely and rigidly together, so that they cannot easily slide past each other (potential energy dominates).


The liquid state

  • Liquids have:
    • indefinite shape and definite volume • high density
Read More

df

The C refers to policies, practices and impacts of corporations, historically governments used to grant special licenses to corporations to pursue large public projects, successfully society needed additional assurance about their sociability.

The S captures the location, since businesses play a role in society, this suggests that behavioral risks can be socially punished through boycotts or social media critiques, while good behavior that exceed societal expectations is rewarded.

The R stands for

Read More

chemistry

ch-4  Characteristics of periodic table
Ɣ There are 7 periods (horizontal row) and 18 groups (vertical column) in the
periodic table.
Ɣ All periods start with group 1 at the extreme left and extend up to group 18 at the
extreme right.
Ɣ A small table composed of 2 horizontal rows and 14 perpendicular columns is
displayed beneath the main periodic treble. It is also the part of period-6 and
period-7 of main periodic table.
Ɣ In the first period (period-1) there are only two elements, which exist in
Read More