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### 30 Cards in this Set

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 Molecular mass sum of the atomic masses of the atoms in a molecule mole represents the amount of a substance mole equal to the amount a substance measured out to be its atomic mass, molecular mass, or formula mass in grams moles of different atoms all have different masses, cause the size of each individual particle is different, but similar in that they each contain the same number of particles molarity measurement for a solution concentration symbol for molarity M molarity(M)=? moles of solute/ liter or (dm to the third) 1dm to the third= 1L 1cm to the third= 1mL percentage Compostion gives the relative amount (percentage) of each element present within the compound percentage composition= # atoms of an elementx atomic mass of the element/ formula mass of the compound all times 100 empirical formula indicates the smallest whole number ration of the elements of each atom present in a compound molecular formula indicates the actual munber of each atom present in a compound to determine the empirical formula of a compound step 1 determine the # of grams of each element in the compound( if percentage composition is given assume a 100g sample) to determine the empirical formula of a compound step 2 convert the grams of each element to moles by dividing each by its atomic mass to determine the empirical formula of a compound step 3 determine the mole ration of the elements by dividing the moles of each element by the smallest # of moles to determine the empirical formula of a compound step 4 use the mole ration to write the empirical formula of the compound finding molecular formula step 1 determine the empirical formula and calculate its mass finding molecular formula step 2 divide the mass of the molecular mass( the mass of the molecular formula) by the mass of the empirical formula. finding molecular formula step 3 multiply the empirical formula by your answer to #2 Hydrates compounds that have water molecules attached to their crystal structure hydrates step 1 calculate the mass of water and convert it moles hydrates step 2 calculate the mass of the anhydrous salt (dried salt) and convert it to moles hydrates step 3 divide your answer in 2 by your answer in 1 to determine the # of water molecules for each salt particle in the hydrate Another name for the mole Amadeo Avogadro's rule diatomic elements come in pairs What are the diatomic elements? H O N Cl F I Br dilute more water concentrated less water si prefixes kilo k 1000 deci d .1 centi c .01 milli m .001 micro u .000001 nano n .000000001