Chlorine exists primarily as 37cl and 35cl and has an average atomic weight of 35.453. the abundance of cl with atomic weight of 35 is

- Abundance of Cl-35 is 0.7735 or 77.35%.

Solution:- The formula used for calculating the average atomic mass is:

average atomic mass = First isotope mass(abundance) + Second isotope mass(abundance)

Note:- For this formula, we use the decimal abundances, For example if the percent abundance of an isotope is 90% then in decimal it is 0.9.

The sum of abundances of all the isotopes of an element is 1. let's say the abundance of Cl-35 is X then the abundance of Cl-37 would be 1-X. Mass of Cl-35 is 35 and that of Cl-37 is 37 and the average atomic mass is given as 35.453. Let's plug in the values in the formula and solve it for X.

35.453 = 35(X) + 37(1-X)

35.453 = 35X + 37 - 37X

35.453 - 37 = 35X - 37X

-1.547 = -2X

Negative sign is canceled as it's on both sides.

1.547 = 2X

X = 0.7735

So, the abundance of Cl-35 is 0.7735 or 77.35%.

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.