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Chlorine has 2 isotopes and These have atomic masses 34.9689 amu and 36.9659 amu respectively Their ratio in nature is 75.77 percent and 24.23 percent respectively Calculate the average atomic ma?
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∙ 14y ago
Atomic Mass of = 34.9689 amu
Atomic mass of = 36.9659 amu
% of = 75.77
% of = 24.23
Average atomic mass = amu
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∙ 14y ago
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Why is choline 35.5 on the periodic table?
On the periodic table, the atomic weight listed for most of the elements is the average of that element's isotopes. Chlorine has 2 common isotopes: Chlorine-35 (75.77% of all chlorine) and chlorine-37 (24.23%). This has two extra neutrons. This works out to an average of 35.453.
In the periodic table it lists chlorine what does the number 35.453 mean?
The number that's in the position where chlorine has "35.453" is the average atomic mass in atomic mass units for that element assuming the various isotopes are present in their "natural" ratio. The two common isotoped of chlorine are chlorine-35 and chlorine-37; since in nature there are about 3 35Cl atoms per 37Cl atom, the ratio works out to be distinctly non-integral (also contributing slightly to the non-integral average mass is the fact that the atomic masses of the two isotopes are not EXACTLY 35 and 37).
Is an average mass of the different isotopes of the element?
Yes, weighted by how often the isotopes are found in nature.
Which is the average of the mass numbers of an element's isotopes?
the Atomic Mass
How do you calculate average atomic masses of elements?
Many elements consist of more than one naturally occurring isotope. The average atomic mass of an element is the "weighted" average. This means that more "weight" or importance is given to the isotope which is in greater natural abundance.We know the percentages of each isotope. To do the calculation we will express each percentage as its corresponding decimal fraction.Average atomic mass = (fraction1 x atomic mass1) + (fraction2 x atomic mass2) + (fraction3 x atomic mass3) ...Cstspeedy has given you the gist of the calculation, and has mentioned that the numbers used will only produce an approximation of the average atomic mass. What should be used are more precise measurements of the percent abundances and the actual masses of the isotopes.This is the important part. The mass numbers are NOT the actual masses of the isotopes. They are close, but not the same. The actual isotopic masses are known very precisely.For instance, Cl-37 has a mass of 36.965902591 amu. We don't need to use all those digits, but they represent the actual mass of the isotope.So for the chlorine example, where there are only two naturally occurring isotopes, you would use the following. 75.58 percent of chlorine atoms are chlorine-35 and 24.22 percent of chlorine atoms are chlorine-37.The average atomic mass = 0.7578 x 34.9689 + 0.2422 x 36.9659 = 35.453 amu
Why is the atomic weight of chlorine 35.623?
It is not. It is 35.453. On the periodic table, the atomic weight listed for most of the elements is the average of that element's isotopes. Chlorine has 2 common isotopes: Chlorine-35 (75.77% of all chlorine) and chlorine-37 (24.23%). This has two extra neutrons. This works out to an average of about 35.5 or what is stated in the question.
How is the atomic mass for chlorine related to isotopes for that atom?
The average atomic mass is weighted by the most common isotopes and their relative abundance.
Is the atomic weight of chlorine 35.5 because of electrons?
No, electrons only make a negligible contribution to atomic weight. On the periodic table the atomic weight listed for most of the elements is the average of that element's isotopes. Chlorine has 2 common isotopes: Chlorine-35 (75.77% of all chlorine) and chlorine-37 (24.23%) This works out to an average mass of about 35.5.
How many neutron's does chlorine have?
the average amount of neutrons in chlorine is 18, but there could be more or less with the different isotopes
Why is choline 35.5 on the periodic table?
On the periodic table, the atomic weight listed for most of the elements is the average of that element's isotopes. Chlorine has 2 common isotopes: Chlorine-35 (75.77% of all chlorine) and chlorine-37 (24.23%). This has two extra neutrons. This works out to an average of 35.453.
Where does the 0.5 in chlorine's atomic mass come from?
The atomic mass of chlorine is a weighted average of the masses of all its naturally occurring isotopes, taking into account their abundance. Chlorine has two main isotopes, chlorine-35 (with an atomic mass of approximately 34.97) and chlorine-37 (with an atomic mass of approximately 36.97). The 0.5 difference in the atomic mass comes from the relative abundance of these isotopes in nature.
Why does chlorine have fractional atomic mass?
Chlorine naturally occurs with mixed isotopes, and the number is an average of the atomic mass of those isotopes, in the proportion they are present. The isotopes have the same atomic number (protons), but their mass number can be different due to the presence of a different number of neutrons. These atoms of an element having a different number of neutrons are called isotopes.
How do you calculate the atomic mass of an element containing a mixtures of isotopes?
weighted average of the various iisotopes
Why is chlorine mass number 35.5?
Example 1.2: chlorine consists of 75% chlorine-35 and 25% chlorine-37.** Think of the data based on 100 atoms, so 75 have a mass of 35 and 25 atoms have a mass of 37. The average mass = [ (75 x 35) + (25 x 37) ] / 100 = 35.5So the relative atomic mass of chlorine is 35.5 or Ar(Cl) = 35.5because of isotopes.there is 75% Cl with mass number 35 and 25% with mass number 37so 35 x 3/4 + 37 x 1/4 = 35.5
How does chlorine has 35.45?
The atomic mass of 35.45 is an average value. Chlorine has two principal stable isotopes, 35Cl (75.78%) and 37Cl (24.22%). Thus we account for the proportion of each isotope and derive an average atomic mass for chlorine. Atomic mass = 0.7578(35) + 0.2422(37) = 35.45
Why is relative atomic mass of atoms never a whole number?
The atomic weight is the average weight of an element when all of the isotopes are averaged. This does not mean that there is a portion of a neutron in the atom.. All of the isotopes of an element have a whole number of protons and neutrons. the atomic weight is the average of all the isotopes found, it is affected by the ratios of the different isotopes. If the number was a whole number then no known isotopes have been found.
In the periodic table it lists chlorine what does the number 35.453 mean?
The number that's in the position where chlorine has "35.453" is the average atomic mass in atomic mass units for that element assuming the various isotopes are present in their "natural" ratio. The two common isotoped of chlorine are chlorine-35 and chlorine-37; since in nature there are about 3 35Cl atoms per 37Cl atom, the ratio works out to be distinctly non-integral (also contributing slightly to the non-integral average mass is the fact that the atomic masses of the two isotopes are not EXACTLY 35 and 37).
