1. What is Molar Mass?

Molar mass is the mass of one mole of a substance, expressed in grams per mole (g/mol). For chemical compounds, it's the sum of the atomic masses of all atoms in the molecule.

2. How to Calculate Molar Mass?

The molar mass calculation formula:

Where:

• \( n_C \) — Number of carbon atoms
• \( n_H \) — Number of hydrogen atoms
• 12.01 — Atomic mass of carbon (g/mol)
• 1.008 — Atomic mass of hydrogen (g/mol)

Example: For ethyne (C₂H₂): MW = 2×12.01 + 2×1.008 = 26.04 g/mol

3. Importance of Molar Mass

Details: Molar mass is essential for stoichiometric calculations, converting between mass and moles, determining empirical and molecular formulas, and calculating solution concentrations.

4. Using the Calculator

Tips: Enter the number of carbon and hydrogen atoms in the molecule. The calculator will automatically compute the molar mass using standard atomic weights.

5. Frequently Asked Questions (FAQ)

Q1: What is the molar mass of ethyne (C₂H₂)?
A: The molar mass of ethyne is 26.04 g/mol (2×12.01 + 2×1.008).

Q2: Why are atomic masses not whole numbers?
A: Atomic masses are weighted averages of naturally occurring isotopes, which is why they have decimal values.

Q3: Can I calculate molar mass for other elements?
A: Yes, this calculator can be modified to include other elements by adding their atomic masses and input fields.

Q4: What's the difference between molecular weight and molar mass?
A: Molecular weight is dimensionless (relative to carbon-12), while molar mass has units of g/mol, but numerically they are the same.

Q5: How accurate are the atomic masses used?
A: The atomic masses (C: 12.01, H: 1.008) are standard values from IUPAC and are sufficiently accurate for most chemical calculations.