About

Precise determination of molar mass is a fundamental requirement in stoichiometric analysis, solution preparation, and reaction engineering. This utility computes the unified atomic mass of chemical compounds by aggregating the standard atomic weights of constituent elements. Unlike basic summation tools, this system handles complex syntax including nested parentheses and hydrate notation (dot notation).

Accuracy in these calculations is critical for experimental reproducibility. An error in molar mass derivation propagates through molarity calculations, potentially invalidating titration results or yield projections. This tool utilizes IUPAC standard atomic weights to ensure high-precision output suitable for academic and industrial chemical formulation.

Formulas

The molar mass M is calculated by summing the products of the atomic weight A_w and the stoichiometric subscript n for every element i in the compound.

M = k∑i=1 (n_i × A_w,i)

For hydrates denoted by the dot operator (e.g., CuSO₄ ⋅ 5H₂O), the mass calculation expands to include the anhydrous part mass M_anh and the water mass M_water multiplied by the coefficient c.

M_total = M_anh + (c × M_water)

Reference Data

Compound Name	Formula	Molar Mass (g/mol)	State STP
Water	H₂O	18.015	(l)
Glucose	C₆H₁₂O₆	180.156	(s)
Table Salt	NaCl	58.440	(s)
Sulfuric Acid	H₂SO₄	98.079	(aq)
Ethanol	C₂H₅OH	46.069	(l)
Calcium Carbonate	CaCO₃	100.087	(s)
Copper(II) Sulfate Pentahydrate	CuSO₄⋅5H₂O	249.685	(s)
Benzene	C₆H₆	78.112	(l)
Acetone	C₃H₆O	58.080	(l)
Ammonium Nitrate	NH₄NO₃	80.043	(s)
Iron(III) Oxide	Fe₂O₃	159.687	(s)
Sodium Hydroxide	NaOH	39.997	(s)

Frequently Asked Questions

The algorithm uses a stack-based parser. When it encounters parentheses like in Calcium Nitrate Ca(NO3)2, it calculates the mass of the internal group (NO3) and multiplies the entire sum by the subscript following the closing parenthesis (2). This supports multiple nested levels.

Chemical symbols are case-sensitive by standard. "Co" represents Cobalt, whereas "CO" represents Carbon Monoxide (Carbon and Oxygen). To prevent ambiguity and ensure calculation safety, the parser strictly follows standard capitalization rules.

This calculator uses the standard atomic weights recommended by IUPAC. These values represent the weighted average of isotopic masses found in the earth's crust. It does not calculate masses for specific isotopic enrichment (e.g., Carbon-14 specifically).

Yes. You can use standard dot notation. For example, entering "CuSO4.5H2O" or "CuSO4 . 5H2O" will correctly calculate the mass of Copper(II) Sulfate Pentahydrate by adding the mass of five water molecules to the base compound.

Per chemical convention, the absence of a subscript implies a count of 1. For instance, in "NaCl", both Sodium (Na) and Chlorine (Cl) are treated as having a quantity of 1.