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Chemistry: (d) Mole Conversions, Molecular/Empirical Formulas, Stoichiometry, Molarity, Limiting Rea

Home Get App Take Quiz Create Why are moles used? You can't directly count atoms, moles are used instead Does the molar masses of 2 difference substances or the number of particles in a mole always remain the same? number of particles in a mole What do each of the letters in the ideal gas law (PV=nRT) stand for? pressureXvolume= number of molesXgas constantXtemperature In the ideal gas law, what unit must the volume and the temperature always be in? Volume: liters Temperature: kelvin What are molecular formulas the same as? empirical formulas or some whole number multiple of it What are the three steps to getting a molecular formula? 1) get empirical 2) divide molar mass from problem by molar mass from the empirical formula 3) multiple subscripts by answer to #2 What are the two things empirical formulas show? the lowest whole number ratio of elements actual numbers of atoms in molecules What are the four steps for empirical formulas? 1) assume % is grams 2) convert grams to moles 3) divide by smaller number 4) multiply to get whole numbers What is a skeleton equation? unbalanced equation What are the 7 elements that exist as diatomic molecules? hydrogen, nitrogen, oxygen, florine, chlorine, bromine, iodine What is the definition of sstoichiometry? using balanced equations to determine the amounts of R needed to create a specific amount of P Why do we care about stoichiometry? companies use stoichiometry to reduce waste, keep costs down and create products that work we use ideas of stoich in everyday lives What is molarity? moles of solute per liter of solution What is a solute? Give an example. substance which dissolves (like NaCl) Why do we need molarity? for aqueous solutions b/c molar mass cannot be used for them T or F? 100g of NaCl (aq) is different than 100g of NaCl (s). True False true What is the equation for molarity? M=moles over liters How can you tell if the problem is a limiting reagent one? more than one reactant amount is given How do you do a limiting reagent problem? convert 1st reagent to product (g) convert 2nd reagent to product (g) pick lowest one How can you tell if a problem is one, two or three steps? one- moles to moles two- moles to something else or something else to moles three- no moles mentioned What does percent yield measure? how much of the expected product you actually get

Author alipeace11 ID 90175 Card Set Chemistry: (d) Mole Conversions, Molecular/Empirical Formulas, Stoichiometry, Molarity, Limiting Rea Description chemistry (unit 5) Updated 2011-06-11T16:52:13Z Show Answers