Grams to Moles Calculator
A mole is a fixed count of particles, about 6.022 times ten to the twenty-third. Chemists use it because it lets them count atoms by weight. This page turns a mass into moles once you know the substance's molar mass.
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How it works
Moles equal the mass divided by the molar mass. The mass is taken in grams here, and the molar mass is the number of grams in one mole. Ounces, pounds and kilograms are converted for you first.
The molar mass comes from adding up the atomic masses in the formula, which you can look up on a periodic table or a data sheet.
Worked example
A sample of 0.35 oz with a molar mass of 18.02 grams per mole is 0.551 moles.
Questions
Where do I find the molar mass?
Add up the atomic masses of each atom in the formula, using a periodic table. Many data sheets also list it.
Why use moles instead of grams?
Equal numbers of moles hold equal numbers of particles, so moles let you compare amounts of different substances fairly.
Does this work for mixtures?
No. It handles one substance with a single molar mass. Work out each part separately.
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