Question

Chlorine occurs in nature in 2 isotonic forms with masses 35u and 37u in the ratio of 3:1. Calculate the average atomic mass of chlorine atom on the basis of this data.

Answer 1

Answer:

Explanation:The average atomic mass of chlorine atom is 35.5 amu

Explanation:

Average atomic mass 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:

We are given:

Two isotopes of chlorine which are Cl-35 ansd Cl-37

Average atomic mass of silicon = ?

The average atomic mass of chlorine atom is 35.5 amu

Answer 2

% of 37Br37 Br= 100-75 = 25%

Average atomic mass = (35 x 75/100 + 37 x 25/100) = 105 + 37 /4 = 142/4 = 35.50 u

(ii)Nucleus of an aom is heavy.Nearly , all the mass of the atom resides inside the nucleus.Protons and neutrons are found in the nucleus.THerefore , the nucleus is heavy.