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What will be the mass of one atom of C-12 in grams ? |
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Answer» Solution :The MASS of a `""^(12)C` (carbon-12) atom was determined by a mass spectrometer and it was found to be EQUAL to `1.992648xx10^(-23)` g. It is KNOWN that 1 mole of `""^(12)C` weighing 12 g contains `N_(A)` number of ATOMS.Thus, 1 mole of `""^(12)C` atoms `= 12 g = 6.022xx10^(23)` atoms `6.022xx10^(23)` atoms of `""^(12)C` have mass `= 12g` `:.` 1 atom of `""^(12)C` atom will have mass `= (12)/(6.022xx10^(23))g` `= 1.992648xx10^(-23)g ~~1.99xx10^(-23)g` |
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