Posted by admin on May 1, 2019 in Chemistry | 0 comments
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 - p1) / p10 =
Posted by admin on Apr 10, 2019 in Chemistry | 0 comments
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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
Posted by admin on Mar 22, 2019 in Chemistry | 0 comments
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……………
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Posted by admin on Nov 14, 2018 in Chemistry | 0 comments
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
•
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Posted by admin on Aug 29, 2018 in Chemistry | 0 comments
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
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Posted by admin on Aug 22, 2018 in Chemistry | 0 comments
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
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