mol concept

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solubulity table

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1. all group 1 cations salts are soluble, all ammonium salts are soluble, all nitrate salts are soluble, all chloride salts except lead chloride and silver chloride are soluble, all sulfate salts except lead sulfate calcium sulfate and barium sulfate are soluble, all group 1 carbonates salts and ammonium carbonates are soluble, all group 1 oxides and group 1 hydroxides are soluble.

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define relative atomic mass

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relative atomic mass of an element is the ratio of the average mass of one atom of that element to 1/12 of the mass of an atom of carbon - 12.

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define isotopes

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isotopes are atoms of the same element with the same number of protons but different number of neutrons.

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define relative isotopic mass

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relative isotopic mass of a particular isotope is the ratio of the mass of one atom of that isotope to 1/12 the mass of an atom of carbon - 12

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define relative molecular mass

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relative molecular mass of a molecule is the ratio of the average mass of one molecule to 1/12 the mass of an atom of carbon - 12.

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define relative formula mass

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relative formula mass of an ionic compound is the ratio of the average mass of one formula unit of that compound to 1/12 the mass of an atom of carbon - 12.

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definition of avogadro constant

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the number of particles in one mole of any substance is a constant known as avogrado constant which is equal to 6.02 x 10^23

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define mole

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one mole contains exactly 6.02 x 10^23 elementary particles

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define emperical formula

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the empirical formula of a compound shows the simplest ratio of each type of atoms in a compound

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define molecular formula

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the molecular formula of a compound shows the actual number of atoms in a compound