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9 Cards in this Set
- Front
- Back
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mole
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(mol)
the SI base unit used to measure the amount of a substance - the number of representative particles, carbon atoms, in exactly 12 g of pure carbon-12 *6.02 X 10^23 |
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representative particle
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any kind of particle
- atoms - molecules - formula units - electrons - ions |
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avogadro's number
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6.02 X 10^23
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molar mass
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the mass in grams of one mole of any pure substance
unit: g/mol numerically equal to an elements atomic mass the masses of all elements are established as relative to the mass of carbon-12 i.e. 1 mole hydrogen-1 is 1/12 the mass of 1 mole carbon-12 |
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subscripts in the chemical formula of a compound
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tell you the number of atoms of each element present in one molecule of the compound
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percent composition
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(mass of elemment / mass of compound) X 100
= percent by mass |
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stoichiometry
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the study of quantitative relationships between amounts of reactants used and products formed by a chemical reaction
based on the law of conservation of mass (mass of reactants = mass of products) |
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mole ratio
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the ratio between the numbers of moles of any 2 substances in a balanced equation
- determined using coefficients - each substance in a balanced chemical equation can be the numerator in a mole ratio with the remaining substances in the reaction |
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moles of unknown
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= moles of known X (moles of unknown/moles of known)
mole ratios are used as conversion factors to convert a known number of moles of one substance to moles of another substance in the same chemical reaction |
