Question

Cl has 2 isotopes atomic mass units34.97and36.97andrelative abundence of the isotope is 0.755 and 0.245 find average atomic mass of chlorine

Answer 1

Task:

Cl has 2 isotopes atomic mass units 34.97 and 36.97 and relative abundance of the isotope is 0.755 and 0.245 find average atomic mass of chlorine

Solution:

The average atomic mass of chlorine is

$$A W _ {\text {average}} = x _ {1} \cdot A W _ {1} + x _ {2} \cdot A W _ {2}$$

x1 – the fraction of the first isotope

x2 – the fraction of the second isotope

AW1 – atomic weight of the first isotope

AW2 – atomic weight of the second isotope

$$A W _ {\text {average}} = 0.755 \cdot 34.97 + 0.245 \cdot 36.97 = 35.46 \text{ g/mol}$$

Answer: $A W_{\text{average}} = 35.46 \text{ g/mol}$