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To calculate the atomic mass of molybdenum based on the isotopic data from planetesimal 98765 ALEKS, we’ll follow these steps:

### Step 1: Extract Isotope Data
- **Isotope \( \ce{^{98}Mo} \):** Mass = 97.91 amu, Relative Abundance = 99.0%
- **Isotope \( \ce{^{100}Mo} \):** Mass = 99.91 amu, Relative Abundance = 1.0%

### Step 2: Convert Relative Abundance to Decimal Form
For each isotope, convert the relative abundance percentage into decimal form:
- For \( \ce{^{98}Mo} \): \( 99.0\% = 0.99 \)
- For \( \ce{^{100}Mo} \): \( 1.0\% = 0.01 \)

### Step 3: Calculate the Weighted Average (Atomic Mass)
The atomic mass can be calculated by taking the sum of the products of each isotope's mass and its relative abundance:

\[
\text{Atomic Mass} = (97.91 \times 0.99) + (99.91 \times 0.01)
\]

Calculating each term:
- \( 97.91 \times 0.99 = 96.9309 \)
- \( 99.91 \times 0.01 = 0.9991 \)

Now, summing these values:
\[
\text{Atomic Mass} = 96.9309 + 0.9991 = 97.93 \, \text{amu}
\]

### Final Answer
The atomic mass of molybdenum for 98765 ALEKS, rounded to three significant digits, is:
\[
\text{Atomic Mass} = 97.9 \, \text{amu}
\]

Would you like more details on any step? 

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### Related Questions:
1. How is atomic mass calculated when more than two isotopes are present?
2. What factors influence isotopic abundances on different celestial bodies?
3. How does this calculated atomic mass compare to the Earth-based atomic mass of molybdenum?
4. What role do isotopes play in determining the average atomic mass of an element?
5. Why is rounding significant in scientific calculations, especially in atomic mass?

### Tip:
When calculating weighted averages, ensure all percentages are converted to decimal form for accuracy.

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: 98Mo, Mass: 97.91 amu, Relative Abundance: 99.0%
Isotope: 100Mo, Mass: 99.91 amu, Relative Abundance: 1.0%

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.

Determine the atomic mass of molybdenum on planetesimal 98765 ALEKS using isotopic mass and relative abundance. This problem involves calculating a weighted average of isotopes 98Mo and 100Mo and rounding to 3 significant digits. Suitable for high school students in Grades 9-12.

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