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Posted by 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
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chemistry

Posted by 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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Untitled 1

Posted by 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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asd

Posted by 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 Read More

Borosilicate

Posted by on Feb 13, 2018 in Chemistry | 0 comments

Virtually all modern laboratory glassware is borosilicate glass. It is so widely used in this application due to its chemical and thermal resistance and good optical clarity, but the glass can be reacted with sodium hydride to produce sodium borohydride, a common laboratory reducing agent.Fused quartz is also found in some laboratory equipment when its higher melting point and transmission of UV are required (e.g. for tube furnace liners and UV cuvettes), but the cost and difficulty of working

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Ddeontologia

Posted by on Jan 19, 2018 in Chemistry | 0 comments

THE LOCAL BOARDS OF SECURITY

Article 54 of Law 2 / 86: municipalities with their own police force, set up a local board of safety shall be the authority to establish the ways and means of collaboration among security and police forces in its territory.

Constitution: the creation depends on the administrations involved and have their own police force. Is done through an act they have to sign the government delegate and the mayor.
Composition: They will be chaired by the mayor, unless the delegate Read More