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Express unified atomic mass unit in kg....

Express unified atomic mass unit in kg.

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`1u = (1)/(12)xx` mass of an atom of carbon -12 isotope `""_(6)C^(12)`,
including the mass of electrons.
`=(1)/(12)xx(12g)/(6.023xx10^(23))`
`=1.66xx10^(-24)g`
`=1.66xx10^(-27)kg`.
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