Isotope and Atomic Mass Problems
In a sample of chlorine gas or in any of its compounds, chlorine exists as both chlorine-35 and chlorine37. The mass of chlorine-35 atoms 34.97 amu and these account for 75.77% of all chlorine atoms. The
mass of chlorine-37 atoms is 36.97amu and these account of the other 24.23%. What is the average mass
of a chlorine atom?
Calculate the atomic mass of bromine in a brine sample that contains 50.54% bromine-79 (mass 78.918
amu) and 49.46% bromine-81 (mass 80.916 amu).
Isotope and Atomic Mass Problems
In a sample of chlorine gas or in any of its compounds, chlorine exists as both chlorine-35 and chlorine37. The mass of chlorine-35 atoms 34.97 amu and these account for 75.77% of all chlorine atoms. The
mass of chlorine-37 atoms is 36.97amu and these account of the other 24.23%. What is the average mass
of a chlorine atom?
Calculate the atomic mass of bromine in a brine sample that contains 50.54% bromine-79 (mass 78.918
amu) and 49.46% bromine-81 (mass 80.916 amu).
Calculate the the atomic mass of krypton in a natural sample, which consists of 0.3% krypton-78 (77.92
amu), 2.3% krypton-80 (79.91 amu), 11.6% krypton-82 (81.91 amu), 11.5% krypton-83 (82.92 amu),
56.9% krypton-84 (83.91 amu), and 17.4% krypton-86 (85.91 amu).
Look up the atomic mass of gold, Au, on your periodic table.
If 1 amu=1.6605 x 10-24 grams, what is the mass in grams of one gold atom.
The atomic mass of carbon-12 is the standard by which all other atomic masses are determined. It was
arbitrarily set to be exactly 12.000 amu. Explain why the atomic mass of carbon on your periodic table
isn’t the same as this value.
Calculate the the atomic mass of krypton in a natural sample, which consists of 0.3% krypton-78 (77.92
amu), 2.3% krypton-80 (79.91 amu), 11.6% krypton-82 (81.91 amu), 11.5% krypton-83 (82.92 amu),
56.9% krypton-84 (83.91 amu), and 17.4% krypton-86 (85.91 amu).
Look up the atomic mass of gold, Au, on your periodic table.
If 1 amu=1.6605 x 10-24 grams, what is the mass in grams of one gold atom.
The atomic mass of carbon-12 is the standard by which all other atomic masses are determined. It was
arbitrarily set to be exactly 12.000 amu. Explain why the atomic mass of carbon on your periodic table
isn’t the same as this value.