1. What is a Mole?

The mole is the SI unit for amount of substance. One mole contains exactly 6.02214076×10²³ elementary entities (atoms, molecules, ions, or other particles). This number is known as Avogadro's number.

2. Calculation Methods

Moles can be calculated using two primary methods:

Where:

• Mass — The mass of the substance in grams
• Molar Mass — The mass of one mole of the substance (sum of atomic weights)
• Concentration — Molarity (M) which is moles per liter
• Volume — Volume of solution in liters

3. Importance of Mole Calculation

Details: Mole calculations are fundamental in chemistry for stoichiometric calculations, preparing solutions, and determining reaction yields. They bridge the gap between the atomic scale and measurable quantities.

4. Using the Calculator

Tips: Select your calculation method (mass/molar mass or concentration/volume), enter the required values, and click calculate. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between moles and molarity?
A: Moles measure amount of substance, while molarity (M) measures concentration (moles per liter of solution).

Q2: How do I find molar mass?
A: Sum the atomic masses of all atoms in the molecule. For example, water (H₂O) has molar mass ~18.015 g/mol.

Q3: Can I calculate moles from grams alone?
A: No, you always need either molar mass (for mass calculations) or concentration and volume.

Q4: What if my volume is in mL?
A: Convert to liters (1 L = 1000 mL) before calculation. The calculator expects liters for volume.

Q5: Why are moles important in chemical reactions?
A: Chemical equations are balanced in terms of moles, allowing precise calculation of reactants needed and products formed.