1. What is Average Atomic Mass?

The average atomic mass is the weighted average of the atomic masses of all naturally occurring isotopes of an element, taking into account their relative abundances.

2. How Does the Calculator Work?

The calculator uses the average atomic mass formula:

Where:

• \( \text{Avg\_atomic\_mass} \) — Average atomic mass (amu)
• \( \text{abundance\_fraction} \) — Fractional abundance of each isotope
• \( \text{isotope\_mass} \) — Mass of each isotope (amu)

Explanation: The equation accounts for the relative abundance of each isotope and its mass to calculate a weighted average.

3. Importance of Average Atomic Mass

Details: The average atomic mass is what appears on the periodic table and is used in all chemical calculations involving mass relationships.

4. Using the Calculator

Tips: Enter the mass of each isotope in atomic mass units (amu) and their natural abundance in percentage. The sum of abundances should be 100%.

5. Frequently Asked Questions (FAQ)

Q1: Why is average atomic mass not a whole number?
A: It's a weighted average of all naturally occurring isotopes, which have different masses and abundances.

Q2: How many isotopes can I calculate for?
A: This calculator handles two isotopes, but the principle can be extended to any number of isotopes.

Q3: What if my abundances don't add up to 100%?
A: The calculator will still work, but for accurate results, abundances should total 100%.

Q4: Why is average atomic mass important?
A: It's essential for stoichiometric calculations, determining molar masses, and understanding chemical reactions.

Q5: Can this be used for radioactive elements?
A: Yes, as long as you use the natural abundances and masses of stable isotopes.