1. What is the Mole Formula?

The mole formula (n = m/MW) relates the amount of substance (in moles) to its mass and molecular weight. One mole contains exactly 6.02214076×10²³ elementary entities (Avogadro's number).

2. How Does the Calculator Work?

The calculator uses the basic mole formula:

Where:

• \( n \) — Amount of substance (moles)
• \( m \) — Mass of the substance (grams)
• \( MW \) — Molecular weight (grams per mole)

Explanation: The formula converts between mass and number of particles through the molecular weight, which serves as a conversion factor.

3. Importance of Mole Calculation

Details: Mole calculations are fundamental in chemistry for stoichiometric calculations, solution preparations, and chemical reaction balancing. They bridge the macroscopic and microscopic worlds of chemistry.

4. Using the Calculator

Tips: Enter mass in grams and molecular weight in g/mol. Both values must be positive numbers. The molecular weight is the sum of atomic weights of all atoms in the molecule.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between mole and molecule?
A: A mole is a unit of measurement (like a dozen) representing 6.022×10²³ particles, while a molecule is a single particle of a compound.

Q2: How do I find molecular weight?
A: Sum the atomic weights of all atoms in the molecule. For example, water (H₂O) has MW = (2×1.008) + 15.999 = 18.015 g/mol.

Q3: Can I use this for elements as well as compounds?
A: Yes, for elements use their atomic weight (from periodic table) as the molecular weight.

Q4: What if my substance is in kilograms?
A: Convert to grams first (1 kg = 1000 g) before using the calculator.

Q5: How precise should my molecular weight be?
A: Use at least 2 decimal places for most purposes. For very precise work, use more decimal places from IUPAC atomic weights.