Question

Determine the relative molecular mass \& relative formula mass of the following substances. [6] - Chlorine

Answer 1

Relative atomic mass of any element is the weighted average of all the isotopes of that atom present.

For instance chlorine exists as two isotopes

Chlorine 35 percentage - 75%

Chlorine 37 percentage - 25%

RAM = [(75*35) + (25*37)]/ 100

RAM = 142/4 = 35.5 amu

Thus, the relative atomic mass number of chlorine is 35.5.