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Write your text her
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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 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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Posted by admin on Jul 5, 2018 in Chemistry | 0 comments
Apparently unaware of Smeaton’s work, the same principle was identified by Frenchman Louis Vicat in the first decade of the nineteenth century. Vicat went on to devise a method of combining chalk and clay into an intimate mixture, and, burning this, produced an “artificial cement” in 1817[14] considered the “principal forerunner”[3] of Portland cement and “…Edgar Dobbs of Southwark patented a cement of this kind in 1811.”[3]
In Russia, Egor Cheliev created a new binder by mixing lime and
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Posted by admin on May 31, 2018 in Chemistry | 0 comments
In this essay I am going to discuss the development of hierarchical world view and the
struggle for authority in Europe. I will show how the periodical imbalances impacted
during this period toward the churches, society, and the individuals of Europe. I will
provide proof of these imbalances by providing historical and literary examples of
writers such as Dante Alighieri, Geoffrey Chaucer, and Erasmus. I will also talk about
feudalism’s impact on the people in Europe and how this relates to the
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