1. What is the Mole Formula?

The mole formula (n = m/MW) calculates the amount of substance in moles from the mass of a substance and its molecular weight. It's a fundamental calculation in chemistry for quantifying chemical amounts.

2. How Does the Calculator Work?

The calculator uses the mole formula:

Where:

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

Explanation: The formula converts mass to moles using the substance's molecular weight as a conversion factor.

3. Importance of Mole Calculation

Details: Mole calculations are essential for stoichiometry in chemical reactions, preparing solutions with specific molarities, and determining reaction yields.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What exactly is a mole?
A: A mole is the SI unit for amount of substance, defined as exactly 6.02214076×10²³ particles (atoms, molecules, ions, etc.).

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?
A: Yes, for elements use the atomic weight from the periodic table as the molecular weight.

Q4: What about hydrates or salts?
A: Include all water molecules or counterions in the molecular weight calculation (e.g., CuSO₄·5H₂O).

Q5: How precise should my measurements be?
A: Precision depends on your needs. For most lab work, measure mass to at least 3 significant figures.