Regents Chem- the mole
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| A mole | the amount of particles that have their mass in grams equal to their atomic masses. 6.02x10 23 particles
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| Formula mass | sum of all the masses in a formula, in amu’s
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| Gram formula mass | sum of all the masses in a formula, in grams
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| Molar mass | synonym of gram formula mass
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| Percent composition | (mass of the part/mass of the whole cmpd) x 100
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| Percent yield | (mass you actually produced / theoretical maximum amount that could have been produced) x 100
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| Calculation average isotopic mass | multiply each isotopes mass by its abundance in decimal form. Add these to get the final average. DO NOT divide by ANYTHING at the end!
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| Molecule | a group of elements with covalent bonds
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| Formula units | ions, held together by ionic bonds
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| Atoms | elements, not bonded to anything else
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| Empirical formula | contains subscripts in the lowest possible ratio
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| Molecular formula | contains subscripts not reduced to lowest ratio
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| mole ratio | the coefficient ratio from a balanced equation
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| stoichiometry | using mole ratio and mole conversion to predict experimental yields
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