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How is the mass of an element related to...

How is the mass of an element related to the number of atoms present in it ?

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The mass of `6.022 xx 10^23` atoms of a given element is equal to its gram atomic mass.
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ICSE-SOME BASIC CONCEPTS OF CHEMISTRY -SHORT ANSWER TYPE QUESTIONS
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  12. When is the law of constant proportions not obeyed ?

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