1. What is Atomic Weight?

Atomic weight is the weighted average mass of an atom of an element based on the relative abundance of its isotopes. It represents the average mass of all naturally occurring isotopes of an element.

2. How Does the Calculator Work?

The calculator uses the atomic weight formula:

Where:

• \( AW \) — Atomic Weight (u)
• \( Isotope\ Mass \) — Mass of each isotope in atomic mass units (u)
• \( Abundance \) — Relative abundance of each isotope as a fraction

Explanation: The atomic weight is calculated by multiplying each isotope's mass by its relative abundance and summing all the products.

3. Importance of Atomic Weight Calculation

Details: Atomic weight is fundamental in chemistry for stoichiometric calculations, determining molecular weights, and understanding chemical reactions and properties.

4. Using the Calculator

Tips: Enter isotope masses in atomic mass units (u) and abundances as fractions (values between 0 and 1). The sum of abundances should ideally equal 1 for accurate results.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between atomic mass and atomic weight?
A: Atomic mass refers to the mass of a single atom, while atomic weight is the average mass of all naturally occurring isotopes of an element.

Q2: Why are atomic weights not whole numbers?
A: Atomic weights are averages of different isotopes with different masses, resulting in decimal values rather than whole numbers.

Q3: What units are used for atomic weight?
A: Atomic weight is typically expressed in atomic mass units (u) or daltons (Da).

Q4: How accurate is this calculator?
A: The calculator provides theoretical values based on input data. For precise scientific work, consult official IUPAC atomic weight data.

Q5: Can I calculate for elements with more than two isotopes?
A: This calculator handles two isotopes. For elements with more isotopes, the calculation would need to be extended to include all isotopes.