Question
A robot spacecraft returned samples from the planetesimal 98765 ALEK , located in the outer Solar System. Mass- spectroscopic analysis produced the following data on the isotopes of molybdenum in these samples: isotope (amu) abundance mass relative {}^100Mo 99.9 91.8% 95 Mo 94.9 8.2% Use these measurements to complete the entry for molybdenum in the Periodic Table that would be used on 98765 ALEKS. Round your entry for the atomic mass to 3 significant digits. Caution:your correct answer will have the same format but not necessarily the same numbers as the entry for molybdenum in the Periodic Table we use here on Earth.
Solution
4.5
(227 Votos)
Flavia
Profissional · Tutor por 6 anos
Resposta
99.5 amu
Explicação
To determine the average atomic mass of molybdenum based on the given isotopic masses and their relative abundances, we use the formula:
Given the isotopes
and
with masses 99.9 amu and 94.9 amu, and relative abundances 91.8% and 8.2% respectively, we plug these values into the formula to get:
Rounding to three significant digits, the average atomic mass is
amu. This would be the entry for molybdenum in the Periodic Table on 98765 ALEKS.