What is the S.I. unit of mass of substance?
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"The kilogram, symbol kg, is the SI unit of mass. ... "The mole, symbol mol, is the SI unit of amount of substance. One mole contains exactly 6.022 140 76 × 1023 elementary entities. This number is the fixed numerical value of the Avogadro constant, NA, when expressed in the unit mol−1 and is called the Avogadro number.
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The S.I. unit of mass of substance is Kilogram (kg).
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