Question

A robot spacecraft returned samples from the planetesimal 98765 ALEKS, located in the outer Solar System. Mass-spectroscopic analysis produced the following data on the isotopes of molybdenum in these samples:
isotope mass
(amu) relative
abundance
96Mo
95.9
90.6%
95Mo
94.9
9.4%
Use these measurements to complete the entry for molybdenum in the Periodic Table that would be used on 98765 ALEKS. Be sure your answers have the correct number of 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.

Answer 1

Answer:97.8amu

Explanation:

The relative atomic mass of molybdenum is the sum of the masses of all the isotopes of molybdenum in nature.

(90.6/100 × 95.9/1) + (9.4/100 × 94.9/1) =

(0.906×95.9) + (0.094×94.9)=

86.8854+8.9206=97.8amu