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# How many grams are in a mole?

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The amount of grams in a mole varies depending on what substance you are measuring. A mole equals an atom or molecule's atomic mass in grams. For example, carbon has an atomic mass of 12, so 1 mole of carbon weighs 12 grams.

## Keep Learning

The work of Amedeo Avogadro led to the development of the mole as a way to quantify the atomic particles in a given substance. This is needed because chemical reactions depend on the number of reactant particles, not the mass of the reactants. The mole gives chemists a way to easily predict and understand reaction outcomes. One mole of any given substance contains 6.022 x 10 ^23 particles.

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## Related Questions

• A:

The molar mass of KNO3, also known as potassium nitrate, is 101.1 grams per mole. This molecule exists as a single potassium ion and a single nitrate ion held together with an ionic bond.

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• A:

Neon has a molar mass of 20 grams per mole. It has an atomic number of 10 and on the periodic table it is found in period 2, group 18. It is part of the noble gas group.

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As grams are a unit of mass and milliliters are a unit of volume, you need to know the density of the substance you are measuring in milliliters in order to convert the measurement from milliliters to grams. In the case of water, 1 gram = 1 milliliter, so 15 milliliters of water = 15 grams.