1. What Is Molecular Weight?

Molecular weight (molecular mass) is the sum of the atomic weights of all atoms in a molecule. It is expressed in atomic mass units (amu) or grams per mole (g/mol).

2. How To Calculate Molecular Weight

The molecular weight is calculated using the formula:

For acetic acid (CH₃COOH):

• Carbon (C): 2 atoms × 12.01 g/mol = 24.02 g/mol
• Hydrogen (H): 4 atoms × 1.008 g/mol = 4.032 g/mol
• Oxygen (O): 2 atoms × 16.00 g/mol = 32.00 g/mol

Total Molecular Weight: 24.02 + 4.032 + 32.00 = 60.05 g/mol

3. Acetic Acid Composition

Details: Acetic acid, also known as ethanoic acid, has the chemical formula CH₃COOH. It consists of 2 carbon atoms, 4 hydrogen atoms, and 2 oxygen atoms.

4. Using The Calculator

Tips: Enter the number of carbon, hydrogen, and oxygen atoms. The calculator will compute the molecular weight based on standard atomic masses.

5. Frequently Asked Questions (FAQ)

Q1: What is the exact molecular weight of acetic acid?
A: The precise molecular weight of acetic acid is 60.05 g/mol, calculated from the most accurate atomic masses.

Q2: Why are atomic masses not whole numbers?
A: Atomic masses account for isotopic abundance. For example, carbon has isotopes C-12 and C-13, giving an average mass of 12.01.

Q3: What is acetic acid used for?
A: Acetic acid is used in vinegar production, chemical synthesis, food preservation, and as a solvent in various industries.

Q4: Can I calculate molecular weight for other compounds?
A: Yes, this calculator can be used for any compound by entering the appropriate number of atoms for each element.

Q5: What is the difference between molecular weight and molar mass?
A: Molecular weight refers to the mass of one molecule, while molar mass is the mass of one mole of substance. Numerically they are the same but expressed in different units.