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  • Scales with 12 grams of pure carbon-12 powder.
    Rights: Andrew Lambert Photography/Science Photo Library Published 17 August 2011 Size: 26 KB Referencing Hub media

    Exactly 12 grams of pure carbon-12 powder is known as one mole. The number of atoms of carbon-12 present in this one mole sample is 6.022 136 7 x 1023. This number is known as Avogadro’s number.

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