1. What is Number of Moles?

The mole (symbol: mol) is the unit of measurement for amount of substance in the International System of Units (SI). One mole contains exactly 6.02214076×10²³ elementary entities (atoms, molecules, ions, or other particles).

2. How Does the Calculator Work?

The calculator uses the basic mole formula:

Where:

• \( n \) — Number of moles (mol)
• \( m \) — Mass of the substance (g)
• \( MW \) — Molecular weight of the substance (g/mol)

Explanation: This formula relates the mass of a substance to the number of moles through its molecular weight.

3. Importance of Mole Calculation

Details: Calculating moles is fundamental in chemistry for stoichiometric calculations, preparing solutions, and determining reaction yields. It bridges the gap between the microscopic world of atoms and the macroscopic world we can measure.

4. Using the Calculator

Tips: Enter the mass in grams and molecular weight in g/mol. Both values must be positive numbers. The result will be the number of moles of substance.

5. Frequently Asked Questions (FAQ)

Q1: What is Avogadro's number?
A: Avogadro's number (6.022×10²³) is the number of particles in one mole of a substance. It's the proportionality factor between the mole and the number of entities.

Q2: How do I find molecular weight?
A: Molecular weight is the sum of atomic weights of all atoms in a molecule. You can find atomic weights on the periodic table.

Q3: What's the difference between moles and molarity?
A: Moles measure amount of substance, while molarity (M) measures concentration (moles per liter of solution).

Q4: Can I calculate moles for elements and compounds?
A: Yes, this calculation works for both elements and compounds as long as you know the mass and molecular/atomic weight.

Q5: Why is the mole concept important?
A: It allows chemists to count particles by weighing, making it practical to work with substances at laboratory scales.