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Atoms have very very small mass and so u...

Atoms have very very small mass and so usually the masses of atoms are given relative to a standard called atomic mass unit. What is Atomic Mass unit (AMU)?

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MAXIMUM PUBLICATION-SOME BASIC CONCEPTS OF CHEMISTRY-EXAMPLE
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  9. Hydrogen combines with oxygen to form two different compound, namely, ...

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  12. A given compound always contains exactly the same proportion of elemen...

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