Look up common chemical compounds by name and formula, then convert grams into moles and approximate particle counts using the selected molar mass. Use it to test different inputs quickly, compare outcomes, and understand the main factors behind the result before moving on to related tools or deeper guidance.
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Look up the compound, then convert mass into moles This worksheet pairs a quick compound lookup with molar-mass context, amount-of-substance
conversion, and particle-count estimates from the same selected formula.
Compound lookup
H₂O
Water
Molar mass
18.015 g/mol
Moles in sample
0.06
Particles
3.343e+22
Molar conversion sheet
Compound
Water (H₂O)
Entered mass
1 g
Moles
0.06 mol
Estimated particles
3.342848e+22
Uses the selected compound's molar mass and Avogadro's number to translate a gram
amount into amount of substance and approximate particle count.
Chemical compound lookup: formula, molar mass, grams-to-moles context, and particle counts
A chemical compound lookup tool is most useful when it does more than show a name and formula. This page pairs a quick compound reference with molar mass, grams-to-moles conversion, and approximate particle-count context so you can move from a selected formula into the basic quantity relationships used in chemistry class, lab prep, and unit-conversion work.
What a compound lookup should tell you
A chemistry lookup is usually answering a practical question: what is this compound called, what is its formula, and what molar mass should I use in a stoichiometry or concentration calculation? Those three details are the starting point for many classroom and lab problems.
That is why this page treats lookup as the start of a workflow rather than the end of one. Once a compound is selected, the result sheet also shows how a gram amount translates into moles and approximate particle count using the listed molar mass.
How molar conversion is built from the lookup result
Molar mass links a substance’s formula to its measurable mass. Once you know the molar mass in grams per mole, you can divide an entered gram amount by that value to get moles. Multiplying the mole amount by Avogadro’s number then gives an approximate particle count.
This is why a simple lookup can support real chemistry work. If a selected compound has molar mass M, then a sample mass m corresponds to n = m / M moles. The same n can be converted into molecules or formula units by multiplying by 6.022 × 10²³.
moles = mass (g) / molar mass (g/mol)
Core conversion from a measured sample mass into amount of substance.
particles = moles × 6.022 × 10²³
Avogadro's number converts moles into molecules or formula units.
Worked example
Suppose you select water, which has molar mass 18.015 g/mol, and enter a sample mass of 18.015 g. The lookup then shows that the sample contains 1 mole of water. That same result corresponds to roughly 6.022 × 10²³ molecules.
If you instead choose sodium chloride and enter 58.44 g, the result is also about 1 mole. The particle count is numerically the same because one mole always means Avogadro’s number of entities, even though the identity and molar mass of the substance have changed.
What this lookup does not cover
This page uses a curated list of common compounds and fixed molar-mass values. It does not parse arbitrary chemical formulas, distinguish isotopes, or substitute for a full structure, hazard, or spectroscopy database.
Use it for quick lookup and introductory molar conversions. For arbitrary formulas, detailed thermodynamic properties, or substance-specific reference work, use a dedicated molecular-weight parser or a fuller chemistry database.
Further reading
PubChem — Water — PubChem compound record showing formula, molecular weight, and related reference data for a common substance.
NIST Chemistry WebBook — NIST chemistry reference for compound data and related property lookups.
What is the difference between formula and molar mass?
The formula tells you which atoms are present and in what ratio. The molar mass turns that composition into a measurable quantity in grams per mole so you can convert between mass and amount of substance.
Why do two different compounds give the same particle count at one mole?
Because one mole is a counting unit, not a mass unit. Any substance at exactly one mole contains Avogadro’s number of entities, even though the gram mass needed to reach one mole differs from compound to compound.
Can this page look up any arbitrary chemical formula?
No. This tool uses a curated set of common compounds. For arbitrary formulas, a dedicated molecular-weight or formula parser is the better tool.
Does the particle count mean molecules for every substance?
Not always. Molecular substances are usually discussed in molecules, while ionic compounds are more accurately described in formula units. The numeric conversion from moles is the same either way.
