Assuming 100% dissociation, calculate the freezing point and boiling point of a 2.5 m SnCl4 (aq)
Answer:The freezing point of the solution is 249.75 K and boiling point of the solution is 379.4 K.
Molality of = 2.5
a) Depression in freezing point:
i = Van'T Hoff factor = 5 (for 100% dissociation)
= freezing point constant= 1.86Kkg/mol
The freezing point of the solution is .
b) Elevation in boiling point:
i = Van'T Hoff factor = 5 (for 100% dissociation)
=boiling point constant= 0.512 Kkg/mol
The boiling point of the solution is .
The reaction 2A → A2 was experimentally determined to be second order with a rate constant, k, equal to 0.0265 M–1min–1. If the initial concentration of A was 2.00 M, what was the concentration of A (in M) after 180.0 min?
2A → A2
Rate constant = 0.0265 M–1min–1
Initial concentration = 2.00 M
Final Concentration = ?
time, t = 180min
The formular relating the parameters is given as;
1 / [A] = kt + 1 / [A]o
1 / [A] = 0.0265 * 180 + (1 / 2)
1 / [A] = 4.77 + 0.5
[A] = 1 / 5.27 = 0.19M
Why do molecular compounds have low melting points and low boiling points relative to ionic substances??
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, molecular compounds have low melting points and low boiling points relative to ionic substances.What is chemical Compound?
Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond. Molecular compounds possess weak interaction between bonds. these have low melting and boiling points.
Therefore, molecular compounds have low melting points and low boiling points relative to ionic substances.
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In the arrangement of particles within any atom, the outermost sort of particle is always the:________
In the arrangement of particles within any atom, the outermost sort of particle is always the electron.
An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.
All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other.
The electron is subatomic particle that revolve around outside the nucleus and has negligible mass. It has a negative charge.
Mass= 9.10938356×10-31 Kg
It was discovered by j. j. Thomson in 1897 during the study of cathode ray properties.
While neutron and proton are present inside the nucleus. Proton has positive charge while neutron is electrically neutral. Proton is discovered by Rutherford while neutron is discovered by James Chadwick in 1932.
Symbol of proton= P+
Symbol of neutron= n0
Mass of proton=1.672623×10-27 Kg
Mass of neutron=1.674929×10-27 Kg
Which of the following is a FALSE statement about carbohydrates? Glycogen is a complex carbohydrate formed by dehydration synthesis of glucose molecules. Carbohydrates consist of monomers called simple sugars. Dietary glucose is primarily used to drive our metabolic pathways that produce energy. The chemical composition of carbohydrates includes two oxygens and one hydrogen for every carbon present.
The chemical composition of carbohydrates includes two oxygens and one hydrogen for every carbon present.
Generally, each carbon atom in the carbohydrates has one oxygen molecule and 1 – 3 hydrogen (depending on the position of the carbon in the chain and also the types of bonds around it). Usually, the ratio of hydrogen to oxygen in carbohydrates is approximately 2:1 Example of carbohydrates are starch and glycogen.
What is the difference between repetition and replication of an investigation
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Which of the following solutions will have a pH of 1? 1.0M CH3CO2H
What noble gas element has the same number of electrons as O-2
Based on the crystal-field strengths cl- < f- < h2o < nh3 < h2nc2h4nh2, which octahedral ti (iii) complex below has its d-d electronic transition at shortest wavelength?
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Therefore, Cl will give the longest d-d transition when complexed with Ti(III).What is periodic table?
Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.
Cl is the weak field ligand and thus make minimum splitting of d orbitals. So, it will give the longest d-d transition when complexed with Ti(III).
Therefore, Cl will give the longest d-d transition when complexed with Ti(III).
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