11) a sample of rhenium of suspected extrasolar origin (translation: not from this solar
system) was analyzed and found to have an atomic mass of 186.385 amu. two isotopes
of rhenium were found in the sample. their isotopic masses are:
• rhenium-185 (184.952955 amu)
• rhenium-187 (186.955753 amu)
what were the percent abundances of the two isotopes in that sample?

Atomic number 75 is dedicated to an element named rhenium and has been given Re as its chemical name.

Explanation:

With a really low concentration it is one of the rarest metals that is found in Earth's crust.

Like all other elements rhenium also has certain isotopes among with 185 and 187 are the most stable ones. Hence these two are the ones that are naturally available abundance is 34% and 63% respectively.

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error