Atoms, Molecules and Stoichiometry

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What is the Definition of Empirical Formula?

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The empirical formula of a compound shows the simplest whole-number ratio of the elements present.

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What is the relative atomic mass?

What is the relative molecular mass?

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The Ar, of an element is the average mass of the naturally occurring isotopes of the element relative to the mass of an atom of carbon-12. The Mr, is the mass of a molecule relative to the mass of a molecule relative to the mass of an atom of carbon-12, which is given the exact mass of 12.

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What is a mole?

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A mole of substance is the amount of substance that has the same number of particles as there are in 12.00g of carbon-12. The particles may be atoms, molecules, ions or even electrons.

This number of particles is a constant known as Avagadros constant (L), and is approximately 6 x 1023mol-1.

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H

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