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Calculate The Molar Mass of The Following Compounds Acetone

Reviewed by Calculator Editorial Team

Calculating the molar mass of acetone (C₃H₆O) is essential for chemistry students, researchers, and professionals working with organic compounds. This guide explains how to determine acetone's molar mass using atomic weights and provides a step-by-step calculation.

What is molar mass?

Molar mass is the mass of one mole of a substance, expressed in grams per mole (g/mol). It's calculated by summing the atomic masses of all atoms in a compound's molecular formula, weighted by their respective counts.

Molar mass is crucial for stoichiometric calculations, solution preparation, and understanding chemical reactions. For acetone (C₃H₆O), knowing the molar mass helps determine quantities needed for reactions or concentrations in solutions.

How to calculate molar mass

To calculate molar mass:

  1. Identify the molecular formula of the compound
  2. Count the number of each type of atom in the formula
  3. Find the atomic mass of each element from the periodic table
  4. Multiply each atomic mass by the number of atoms of that type
  5. Sum all the values to get the molar mass

Molar Mass Formula:

Molar Mass = (Number of Carbon atoms × Atomic mass of Carbon) + (Number of Hydrogen atoms × Atomic mass of Hydrogen) + (Number of Oxygen atoms × Atomic mass of Oxygen)

For acetone (C₃H₆O), the calculation would be:

(3 × Atomic mass of Carbon) + (6 × Atomic mass of Hydrogen) + (1 × Atomic mass of Oxygen)

Acetone molar mass calculation

Acetone's molecular formula is C₃H₆O, meaning it contains:

  • 3 Carbon (C) atoms
  • 6 Hydrogen (H) atoms
  • 1 Oxygen (O) atom

Using standard atomic masses from the periodic table:

  • Carbon (C) = 12.01 g/mol
  • Hydrogen (H) = 1.008 g/mol
  • Oxygen (O) = 16.00 g/mol

The calculation is:

(3 × 12.01) + (6 × 1.008) + (1 × 16.00) = 36.03 + 6.048 + 16.00 = 58.078 g/mol

Therefore, acetone's molar mass is approximately 58.08 g/mol.

Worked example

Let's calculate the molar mass of acetone step-by-step:

  1. Identify the formula: C₃H₆O
  2. Count atoms:
    • Carbon: 3
    • Hydrogen: 6
    • Oxygen: 1
  3. Get atomic masses:
    • C: 12.01 g/mol
    • H: 1.008 g/mol
    • O: 16.00 g/mol
  4. Calculate each component:
    • 3 × C = 3 × 12.01 = 36.03 g/mol
    • 6 × H = 6 × 1.008 = 6.048 g/mol
    • 1 × O = 1 × 16.00 = 16.00 g/mol
  5. Sum the values: 36.03 + 6.048 + 16.00 = 58.078 g/mol

The molar mass of acetone is 58.08 g/mol (rounded to two decimal places).

Frequently Asked Questions

What is the molar mass of acetone?
The molar mass of acetone (C₃H₆O) is approximately 58.08 g/mol.
How do I calculate molar mass?
Multiply the number of each atom in the formula by its atomic mass, then sum all the values. See the step-by-step guide above.
Why is molar mass important for acetone?
Molar mass helps determine precise quantities needed for reactions, solution concentrations, and stoichiometric calculations involving acetone.
Can I use this calculator for other compounds?
Yes, the calculator can be used for any compound by entering its molecular formula.