1. What is AMU?

The AMU (atomic mass unit) is defined as 1/12 of the mass of a carbon-12 atom. It provides a standard unit for expressing atomic and molecular masses.

2. How Does the Calculator Work?

The calculator uses the AMU definition formula:

Where:

• \( AMU \) — Atomic mass unit
• \( C-12 mass \) — Mass of carbon-12 atom

Explanation: This calculation provides the unified atomic mass unit, which is approximately 1.66053906660 × 10⁻²⁷ kilograms.

3. Importance of AMU Calculation

Details: AMU is fundamental in chemistry and physics for expressing atomic masses, molecular weights, and performing stoichiometric calculations in chemical reactions.

4. Using the Calculator

Tips: Enter the mass of carbon-12 in kilograms. The value must be positive and greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is the exact value of 1 AMU?
A: 1 AMU is exactly 1.66053906660 × 10⁻²⁷ kilograms by definition.

Q2: Why is carbon-12 used as the standard?
A: Carbon-12 was chosen as the standard because it's abundant, stable, and forms many compounds, making it practical for mass spectrometry.

Q3: How is AMU different from Dalton?
A: AMU and Dalton are essentially the same unit, with 1 AMU = 1 Da. The term Dalton is often used in biochemistry.

Q4: What is the mass of carbon-12 in AMU?
A: By definition, carbon-12 has a mass of exactly 12 AMU.

Q5: How accurate is this calculation?
A: The calculation is mathematically exact since AMU is defined as 1/12 of carbon-12's mass.