DOUBLE BOND EQUIVALENTS or INDEX NUMBER:
It is a numerical value on the basis of which we can have an idea about the different type of equivalent structures we can have for a given formula.
Knowing the DBE the problems on structural isomerism can be more easily solved.
Mathematically,
DBE= {( n(v-2))/2}+1
where n is the number of atoms
v is the valency of the atom.
Eg 1):
Consider C4H6
DBE={4(4-2)/2+6(1-2)/2}+1
={(8-6)/2}+1
=2
This implies that the molecule may contain,
1)two double bonds or one triple bond.
2)one ring and one double bond.
3)two rings.
Thus by knowing the DBE total number of structural isomers can be formulated.
Eg 2):
Consider C3H6O
DBE={3(4-2)/2+6(1-2)/2+1(2-2)/2}+1
=1
So the isomers may contain either a double bond or a ring.
I hope this is helpful!
To calculate the number of isomers of a sugar molecule, you can use the formula 2^n, where n is the number of chiral centers in the molecule. Each chiral center can give rise to 2 possible configurations (R and S), leading to 2^n possible stereoisomers. Additionally, consider different types of isomerism such as structural isomers and anomers when calculating the total number of isomers for a sugar molecule.
To find the total number of chromosomes in an organism, you would multiply the haploid number by 2. This is because the haploid number represents half of the total number of chromosomes in a cell. So, total number of chromosomes = haploid number x 2.
To find the total number of electrons in an element, first you need to look up the element's atomic number. That number tells you how many protons are in the element. Then, look up the net charge of the element. The number of protons subtracted by the elements net charge will give you the number of its electrons.
No, you should subtract the ion charge from the total number of valence electrons of the neutral atom to find the total number of electrons available for bonding in a positive ion. This is because a positive ion has lost electrons compared to the neutral atom.
We can find atomic mass and mass number in chemical elements. Atomic mass is about weight of the atom. Mass number is about total of neutrons and protons.
To calculate the number of isomers of a sugar molecule, you can use the formula 2^n, where n is the number of chiral centers in the molecule. Each chiral center can give rise to 2 possible configurations (R and S), leading to 2^n possible stereoisomers. Additionally, consider different types of isomerism such as structural isomers and anomers when calculating the total number of isomers for a sugar molecule.
Information about isomers can be found in all chemistry text books. Isomers are compounds which have the same molecular layout but have a different structure.
Constitutional isomers can be found by comparing the molecular formulas of different compounds and identifying if they have the same number and types of atoms but arranged in different ways. This can be done by examining the connectivity of atoms in the molecules.
unsymmetrical atom & chiral carbonoptical isomers=2nmesomers=osymmetrical atom & chiral carbon- 1,3,5,...optical isomers=2n-1mesomers=2n/2-1symmetrical atom & chiral carbon- 2,4,6,...optical isomers=2n-1-2(n-1)/2mesomers=2(n-1)/2
11
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To find the total number of chromosomes in an organism, you would multiply the haploid number by 2. This is because the haploid number represents half of the total number of chromosomes in a cell. So, total number of chromosomes = haploid number x 2.
====== Answer 1: ----------- proportion... A portion of the total is to its percentage of the total as the total is to 100%.
You find the total number of outcomes by adding the first part of the odds to the second part of the odds. For example: 1:1 The total number of outcomes would be 2. To find the ratio of equally likely outcomes to the total number, find the number of outcomes, and put it on the left of the semicolon. Then put the total number on the right side. For the same example: (outcomes)->1:2<-(total)
The total number of protons.
Number of total marks x100
You have to divide the number of questions you answered correctly of the number of total questions then multiply by 100. (#correct over total#of questions) x 100 Or, you divided 100 by the total number of questions, then multiply by the number you got right to find your percentage.