There are two main isotopes of chlorine. 75% of chlorine atoms have a mass number of 35,while 25% have a mass number of 37 . use this information to work out the relative atomic mass of chlorine.

Answer : The average or relative atomic mass of chlorine is 35.5 amu.

Explanation :

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

As we are given that,

Mass of isotope of chlorine-35 = 35 amu

Fractional abundance of isotope of chlorine-35 = 75 % = 0.75

Mass of isotope of chlorine-37 = 37 amu

Fractional abundance of isotope of chlorine-37 = 25 %  = 0.25

Now put all the given values in above formula, we get:

Therefore, the average or relative atomic mass of chlorine is 35.5 amu.

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