chapter 2 definitions

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unified atomic mass unit

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12 Terms

1

unified atomic mass unit

1/12 the mass of a carbon-12 atom

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2

relative atomic mass

the weighted average of the masses of the molecules relative to 1/12 of the mass of a carbon-12 atom

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3

relative isotopic mass

the mass of the isotope relative to 1/12 of the mass of a carbon-12 atom

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4

relative molecular mass

weighted average of the masses of the molecules relative to 1/12 of the mass of a carbon-12 atom

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5

relative formula mass

weighted average of the masses of the formula unit relative to 1/12 of the mass of a carbon-12 atom

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6

mole

the amount of substance which contains the same number of particles as there are atoms in exactly 12g of carbon-12

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7

Avogadro’s constant

the number of atoms in one mole of c12 which is 6.022×10²3

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8

limiting reagent

the reactant that governs the maximum amount of product that can be formed (the smallest number of moles on the reagent side, using the mole ratio)

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9

percentage yield

percentage of the theoretical yield achieved in practice ( this is how much product is made in an incomplete reaction, compared to how much could be made if the reaction was 100% complete )

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10

percentage purity

the actual mass reacted/the initial mass used expressed as a percentage ( this is how pure as a percentage )

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11

empirical formula

the simplest whole number ratio of atoms present in a substance

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12

molecular formula

the actual number of atoms of each element presents in a substance.

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