Cl-35 has an atomic weight of #"34.9689# and Cl-37 has an atomic weight of #"36.9695#. What is the percent abundance of Cl-35?
1 Answer
The percent abundance of Cl-35 = 76.0%.
Explanation:
The percent abundance of chlorine-35 and chlorine-37 must equal 100, or, in decimal form 1.
Given/Known:
atomic weight of Cl-35
atomic weight of Cl-37
atomic weight of chlorine
Unknown:
SOLUTION:
1. Set up the equation as follows:
2. Carry out multiplication.
3. Combine the x values.
4. Subtract 36.9695 from both sides.
(rounded to two decimal places due to significant figure rounding rules for addition and subtraction)
5. Divide both sides by -2.0006 to calculate abundance.
(rounded to three significant figures due to rounding rules for multiplication and division)
(In this case 1 is an exact number, which has an infinite number of significant figures, so significant figures are dependent upon
6. Multiply abundance times