Question

A robot spacecraft returned samples from the planet 98765 ALEKS, located in the outer Solar System. Mass-spectroscopic analysis produced the following data on the isotopes of tin in these samples:

isotope mass (amu) relative abundance (%)

112 Sn 111.9amu 57%

114 Sn 113.9amu 43%

Use these measurements to determine the atomic mass for Sn (to 3 significant digits). Caution: your correct answer will have the same format but not necessarily the same numbers as the entry for tin in the Periodic Table we use here on Earth.

Answer 1