Chemistry
Molecular Weight Calculator
Lets users compute and verify molecular weight instantly with formula, steps and examples — no manual math.
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Molar mass
18.015 g/mol
Molecular Weight Calculator: molar mass of H2O ≈ 18.015 g/mol.
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About this calculator
Molar mass sums each element's atomic mass times its count in the formula. Supports common elements (H, C, N, O, Na, Mg, S, Cl, K, Ca, Fe) written in standard notation like H2O or C6H12O6.
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