--O ATOMS, ONS AND MOLECULES Finding isotope mass or natural abundance from atom

Question

--O ATOMS, ONS AND MOLECULES Finding isotope mass or natural abundance from atomic There are only two naturally-occuring stable isotopes of chlorine, the masses of which are listed in the table below. Use whatever data you need from the ALEKS Periodic Table to calculate the natural abundance of each isotope and complete the table. Round your entry for 3CI to 4 significant digits and your entry for Cl to 4 significant digits isotope massnatural 5C1 34969 % 37C1 | 36 9661 0% abundance Explanation Check

Explanation / Answer

Actual mass of Chlorine in periodic table = 35.453

Given:

m1 = 34.969 amu

m2 = 36.966 amu

m = 35.453 amu

use:

atomic mass = sum of (mass of isotope * abundance) / 100

m = (m1*A1 + m2*A2)/100

35.453 = ( 34.969*A1 + 36.966*(100-A1))/100

35.453 = ( 34.969*A1 + 3696.6- 36.966*A1))/100

A1 = 75.76 %

A2 = 100 - 75.76 = 24.24 %

Answer:

75.76 %

24.24 %

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