Question

chlorine occurs in nature in the form of two isotopes Cl-35 and Cl-37 if the abundance of Cl-35 isotope is 75% and that of Cl-37 is 25% calculate the average atomic mass of chlorine ​

Answer 1

Answer:

Given Parameters:

• P₁ = 75%
• P₂ = 25%
• A₁ = 35
• A₂ = 37

Unknown:

• We need to find the average atomic mass of chlorine

Solution:

$\longrightarrow\rm A = \dfrac{P_1A_1+P_2A_2}{P_1 + P_2}$

• A = Average atomic mass
• P₁, P₂ = Relative abundance of different isotopes
• A₁, A₂ = Atomic masses of various isotopes

$\longrightarrow\rm A = \dfrac{75 \times 35+25 \times 37}{75+ 25}$

$\longrightarrow\rm A = \dfrac{2625+925}{100}$

$\longrightarrow\rm A =\dfrac{3550}{100}$

$\longrightarrow\rm A = \dfrac{355}{10}$

$\longrightarrow \gray{\underline{ \boxed{ \orange{\bf A = 35.5\:u }}}}$