Questions: A robot spacecraft returned samples from the planetesimal 98765 ALEKS, located in the outer Solar System. Mass-spectroso data on the isotopes of molybdenum in these samples: isotope mass (amu) relative abundance --------- ^100 Mo 99.9 52% ^97 Mo 96.9 48% Use these measurements to complete the entry for molybdenum in the Periodic Table that would be used on 98765 ALEKS. Use the correct number of significant digits.

A robot spacecraft returned samples from the planetesimal 98765 ALEKS, located in the outer Solar System. Mass-spectroso data on the isotopes of molybdenum in these samples: isotope mass (amu) relative abundance --------- ^100 Mo 99.9 52% ^97 Mo 96.9 48% Use these measurements to complete the entry for molybdenum in the Periodic Table that would be used on 98765 ALEKS. Use the correct number of significant digits.
Transcript text: A robot spacecraft returned samples from the planetesimal 98765 ALEKS, located in the outer Solar System. Mass-spectroso data on the isotopes of molybdenum in these samples: \begin{tabular}{|c|c|c|} \hline isotope & \begin{tabular}{c} mass \\ (amu) \end{tabular} & \begin{tabular}{c} relative \\ abundance \end{tabular} \\ \hline${ }^{100}$ Mo & 99.9 & $52 . \%$ \\ \hline${ }^{97} \mathrm{Mo}$ & 96.9 & $48 . \%$ \\ \hline \end{tabular} Use these measurements to complete the entry for molybdenum in the Periodic Table that would be used on 98765 ALEKS. B correct number of significant digits.
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Solution

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Solution Steps

Step 1: Calculate the atomic mass contribution of each isotope.

We multiply the mass of each isotope by its relative abundance.

For ${ }^{100}$Mo: 99.9 amu * 0.52 = 51.948 amu

For ${ }^{97}$Mo: 96.9 amu * 0.48 = 46.512 amu

Step 2: Calculate the average atomic mass.

We sum the atomic mass contributions of each isotope to find the average atomic mass.

Average atomic mass = 51.948 amu + 46.512 amu = 98.46 amu

Step 3: Determine the correct number of significant figures.

Since the relative abundances are given to two significant figures, the final answer should also have two significant figures. Rounding 98.46 to two significant figures yields 98.

Final Answer

\\(\boxed{98}\\)

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