Question

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 1

Answer:

the relative atomic mass of chlorine.

Explanation:

(75×35+25×37)÷100

Answer 2

The relative atomic mass of chlorine having two isotopes with mass number 35 and 37 is 35.5 amu.

Given,

Percentage(percentage abundance) of Chlorine with mass number 35=75%

Percentage(percentage abundance) of Chlorine with mass number 37=25%.

To find,

the relative atomic mass of chlorine.

Solution:

• The relative atomic mass or average atomic mass of an element is given by the sum of the masses of isotope, each multiplied by its relative abundance percentage.
• $AAM=\frac{M1X(abundance)1+M2X(abundance)2}{100}$.
• Its unit can be amu(atomic mass unit) or grams.

The relative atomic mass of chlorine will be,

$AAM=\frac{M1X(abundance)1+M2X(abundance)2}{100}\\AAM=\frac{75X35+25X37}{100} \\AAM=\frac{2625+925}{100} \\AAM=\frac{3550}{100} \\AAM=35.50 amu.$

Hence, the relative atomic mass is 35.50 amu.

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