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What will be the mass of one""^( 12)C at...

What will be the mass of one`""^( 12)C` atom in g?

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1 mol of `""^(12)C` atom , i.e. `6.022 xx 10^(23)` atoms weigh 12 g.
`therefore` Mass of one `""^(12)C` atom `=12/(6.022 xx 10^(23)) = 1.9923 xx 10^(-23)` g
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