Free Molecular Weight Calculator
Calculate the molecular weight of a compound from the number and atomic masses of each element present.
Molecular Weight
180.156 g/mol
Molecular Weight vs Number of Carbon Atoms
Molecular Weight Calculation
The molecular weight (molar mass) of a compound is the sum of the atomic weights of all atoms in its molecular formula.
Formula
MW = sum(n_i × AW_i)
where n_i is the number of atoms of element i and AW_i is the standard atomic weight. Standard atomic weights: C = 12.011, H = 1.008, O = 15.999, N = 14.007, S = 32.065 g/mol.
Example Calculation
Calculate the molecular weight of glucose (C6H12O6).
- 01C contribution: 6 × 12.011 = 72.066
- 02H contribution: 12 × 1.008 = 12.096
- 03O contribution: 6 × 15.999 = 95.994
- 04MW = 72.066 + 12.096 + 95.994 = 180.156 g/mol
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Understanding Molarity
Learn what molarity is, how to calculate it, and why it matters in chemistry. Covers moles, liters, dilution, and step-by-step examples for preparing solutions.