1. Mole-Mass Relationship

The mole (mol) is the SI unit for amount of substance. One mole contains exactly 6.02214076×10²³ elementary entities (Avogadro's number). The mass of one mole of a substance is equal to its molecular weight in grams.

2. How the Calculator Works

The calculator uses these fundamental equations:

Where:

• mass — measured in grams (g)
• moles — measured in moles (mol)
• Molecular Weight — measured in grams per mole (g/mol)

3. Importance of Molecular Weight

Details: Molecular weight (or molar mass) is the sum of the atomic weights of all atoms in a molecule. It serves as the conversion factor between mass and moles for a specific compound.

4. Using the Calculator

Steps:

1. Select calculation type (mass from moles or moles from mass)
2. Enter the known quantity (either mass or moles)
3. Enter the molecular weight of the compound
4. Click "Calculate" to get the result

5. Frequently Asked Questions (FAQ)

Q1: 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.

Q2: Why are moles important in chemistry?
A: Moles allow chemists to count particles by weighing, making it practical to work with the enormous numbers of atoms/molecules in observable quantities.

Q3: What's the difference between molecular weight and formula weight?
A: Molecular weight refers to molecules, while formula weight is used for ionic compounds. Both serve the same purpose in mole-mass calculations.

Q4: How precise should my measurements be?
A: Your precision should match your needs. For most lab work, 4 significant figures is sufficient.

Q5: Can I use this for elements as well as compounds?
A: Yes, use the atomic weight for elements and molecular weight for compounds.