1. What is Molar Mass?

Molar mass is the mass of one mole of a substance (chemical element or chemical compound). It is expressed in grams per mole (g/mol) and is calculated as the sum of the atomic masses of all atoms in a molecule.

2. How to Calculate Molar Mass of Mg(OH)₂

The calculation for magnesium hydroxide (Mg(OH)₂) is:

Where:

• Mg — Atomic mass of magnesium (24.305 g/mol)
• O — Atomic mass of oxygen (15.999 g/mol)
• H — Atomic mass of hydrogen (1.008 g/mol)

Example Calculation: 24.305 + 2 × (15.999 + 1.008) = 58.320 g/mol

3. Importance of Molar Mass

Details: Molar mass is essential for converting between grams and moles of a substance, which is fundamental in stoichiometric calculations for chemical reactions.

4. Using the Calculator

Tips: Enter the atomic masses of each element. Default values are provided based on standard atomic weights. The calculator will sum them according to the chemical formula.

5. Frequently Asked Questions (FAQ)

Q1: Why does Mg(OH)₂ have 2 oxygen and 2 hydrogen atoms?
A: The subscript 2 outside the parentheses means there are two hydroxide (OH) groups in the compound.

Q2: How precise should the atomic masses be?
A: For most calculations, 3-4 decimal places are sufficient. The calculator accepts up to 4 decimal places.

Q3: What's the difference between molecular weight and molar mass?
A: They are numerically the same but molar mass has units of g/mol while molecular weight is dimensionless.

Q4: Why is the molar mass important in chemistry?
A: It's essential for preparing solutions with specific concentrations and for stoichiometric calculations in chemical reactions.

Q5: Can I calculate molar mass for other compounds with this?
A: This calculator is specifically designed for Mg(OH)₂. Different compounds would require different calculations.