1. What is the Mole Formula?

The mole formula relates the amount of substance (in moles) to its mass and molecular weight. It's a fundamental calculation in chemistry for quantifying chemical substances.

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: This formula converts between mass and number of particles (via moles) using the substance's molecular weight as the conversion factor.

3. Importance of Mole Calculation

Details: Mole calculations are essential for preparing solutions, stoichiometric calculations in chemical reactions, and determining reagent quantities in experiments.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What exactly is a mole?
A: A mole is 6.022×10²³ (Avogadro's number) of particles (atoms, molecules, ions, etc.). It's the SI unit for amount of substance.

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 (H) + 15.999 (O) = 18.015 g/mol.

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

Q4: What if I know moles and want to find mass?
A: Rearrange the formula: \( m = n \times MW \). Multiply moles by molecular weight to get mass in grams.

Q5: Why is the mole concept important?
A: It allows chemists to count particles by weighing, making it practical to work with the extremely small sizes of atoms and molecules.