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To calculate the relative Atomic Mass of an element (which is by its definition an average), you need the mass number and relative abundance of each isotope present.

Suppose we have the following data from the mass spectrometer:

first isotope mn X, abundance A%

second isotope mn Y, abundance B%

third isotope mn Z, abundance C%.

Then ram = (A/100 x X) + (B/100 x Y) + (C/100 x Z)

If there are more than 3 isotopes, just do the same for each one and add all the expressions together.

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Related questions

What does the relative atomic mass of an element tell us about the relative abundance of an isotope?

None. The relative abundance of isotopes is used to calculate the Average Mass (by multiplying the Atomic Mass of the isotopes by their relative abundancies and adding the products together) while the Atomic Mass is simply the number of protons plus the number of neutrons.


How does the average atomic mass of an element differ from the mass of an individual atom of the same element?

The masses and relative abundances of all naturally occurring isotopes of the element are required to calculate average atomic mass of the element.


Atomic mass differnet from the atomic mass number why is that?

The atomic mass is an average, allowing for the relative abundances of different isotopes.


Why atomic mass are referred to as average atomic mass?

It allows for the relative abundances of different isotopes.


Why is the atomic mass of an atom the average atomic mass?

It allows for the relative abundances of different isotopes.


How do you calculate the average atomic mass of a element?

The mass of the isotope multiplied by its relative abundance plus the the mass times abundance of other isotopes.(mass of isotope)(relative abundance) + (mass of isotope)(relative abundance) = average atomic massExample: Carbon can be naturally found as carbon- 12 or carbon- 13. The mass of carbon- 12 is 12 amu and it makes up 98.93% of naturally found carbon. The mass of carbon- 13 is 13.00335 amu, and it makes up 1.07% of naturally found carbon. So the equation to calculate the average atomic mass of carbon is:(0.9893)(12 amu) + (0.0107)(13.00335 amu) = 12.01 amu


What is the average atomic mass of an element with two isotopes of 220 and 250?

To calculate the median atomic weight, the relative abundance of each isotope could be calculated or given.


What is the average mass of the mixture of an element's isotopes?

It is called the Relative Atomic Mass.


The weighted average of the masses of all the naturally occurring isotopes of an element is the what?

Atomic weight or atomic mass used in stoichiometric calculations.


Calculate the average atomic mass of copper-63 and copper-65?

63.6166 Relative abundance of Copper-63 is 69.17% and Copper-65 is 30.83%


How relative atomic mass is related to gram?

relative Atomic Mass


How the relative atomic mass is related to gram?

relative atomic mass