1. What is Molar Mass?

Molar mass is the mass of one mole of a substance (chemical element or chemical compound). It is a physical property defined as the mass of a given substance divided by the amount of substance in moles.

2. How Does the Calculator Work?

The calculator uses the molar mass equation:

Where:

• \( MM \) — Molar mass (g/mol)
• \( m \) — Mass of the substance (g)
• \( n \) — Amount of substance (mol)

Explanation: The equation simply divides the mass of the sample by the number of moles to get the mass per mole of substance.

3. Importance of Molar Mass Calculation

Details: Molar mass is fundamental in chemistry for stoichiometric calculations, converting between mass and moles of a substance, and determining molecular formulas.

4. Using the Calculator

Tips: Enter mass in grams and amount of substance in moles. Both values must be positive numbers. The calculator will compute the molar mass in g/mol.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between molar mass and molecular weight?
A: Molar mass is the mass of one mole of a substance (with unit g/mol), while molecular weight is the mass of one molecule (with unit amu or Da).

Q2: How do I find the number of moles if I only know the volume?
A: For gases at STP, you can use the ideal gas law (n = PV/RT) or the molar volume (22.4 L/mol at STP).

Q3: Can this calculator be used for solutions?
A: This calculates molar mass of pure substances. For solutions, you would need concentration information.

Q4: Why is molar mass important in chemical reactions?
A: It allows conversion between mass and moles, essential for balancing equations and calculating yields.

Q5: How accurate is this calculation?
A: The accuracy depends on the precision of your mass and mole measurements. The calculation itself is mathematically exact.