1. Can you actually measure the mass of atoms using a scale like the one in
this lab? Explain.
2. In your post, share the percent abundance and atomic mass of the isotopes
in each of the three mixtures you created. Then, find a classmate's post, and
calculate the average atomic mass of one of their mixtures. Include the
mixture, your work, and final answer when responding to their post. Return
to your post, and read the responses of your classmates. If their calculations
are correct, let them know they are right. If their calculations are not
correct, show them how to calculate the average atomic masses of your
mixtures.
3. How did the average atomic mass change as you varied the percent
abundance of your isotopic mixtures?
4. There are two stable isotopes of lithium. The atomic mass of lithium-6 is
6.02 amu, and the atomic mass of lithium-7 is 7.02 amu. The average
atomic mass of lithium is 6.94 amu. Can you predict which isotope has a
greater abundance based on its average atomic mass? Explain.