[ethanwell]

The two stable isotopes of chlorine have masses of 34.969 amu. and 36.966 amu.
a. What are the mass number of the two isotopes of chlorine?
b. Calculate the % abundance of the lighter isotope. Hint: use periodic table.
c. How many types of molecules with different masses exist in a sample of chlorine gas if the sample exists entirely as diatomic molecules?
d. Calculate the mass of chlorine molecule having the largest molecular mass.
e. What is the mass of the most abundant molecule? Calculate its % abundance.
Please help meeeeeeeeee!!!

[Borek]

You just don't ask. You try, you tell us what you did, we push you in the right direction.