Transcript 800
Conversions Conversion s Take 2 Formulas Formulas Take 2 Definitions Molar Mass
Stoich
Stoich Take 2
Lim/Exc React Lim/Exc React II The Mole Grab Bag
Final Jeopardy
Final Jeopardy Category
Final Jeopardy
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1,230 grams 15.4 moles of Br = _____ grams
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26.53 moles NaCl 2,004 grams NaCl=___ moles
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1.55 x 10 24 formula units .257 moles KCl= ___ formula units
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5.2 x 10 22 atoms Cu 5.5 grams Cu= ____ atoms Cu
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3.37 x 10 24 molecules How many molecules of water (H 2 O) have you drank if you drink 101 grams?
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0.901 moles H 2 1.82 grams H 2 = _____ moles
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920 grams 4.4 moles BaCl 2 = __ grams
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2 x 10 24 molecules 3 moles C 6 H 12 O 6 = ___ molecules
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22.1 grams Li 1.33 x 10 25 atoms Li= ___ grams
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1.03 x 10 24 formula units If you have 127 grams of KCl, how many formula units do you have?
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CH 2 O If the molecular formula of a compound is C 3 H 6 O 3 , what is the empirical formula?
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H 2 O 2 What is the molecular formula of a substance with a molar mass of 34 and an empirical formula of HO?
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CH 3 O What is the empirical formula of a substance with 1.388g C, 0.345g H and 1.850g O?
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Cr 2 O 3 What is the empirical formula of a substance with 68.4% Cr, 31.6% O?
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N 2 O 4 What is the molecular formula of a substance with 0.606g N and 1.390g O and a molar mass of 92?
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CO, or C 2 O 2 , or C 3 O 3 , or C 4 O 4 , etc If the empirical formula of a compound is CO, what is a possible molecular formula?
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C 2 H 6 O 2 What is the molecular formula of a substance with a molar mass of 62 and an empirical formula of CH 3 O?
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AgNO 3 What is the empirical formula of a substance with 63.5g Ag, 8.2g N and 28.3g O?
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Au 2 O 3 What is the empirical formula of a substance with 89.14% Au and 10.80% O?
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N 2 O 5 What is the molecular formula of a substance with 4.04g N and 11.46g O that has a molar mass of 108.0?
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Most reduced version of chemical formula Describe what an empirical formula is
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The reactant that limits the amount of product produced, runs out first Describe what the limiting reactant is
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Chemical formula of compounds as they naturally occur, can be reduced Describe what a molecular formula is
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Grams (molar mass), liters (22.4), particles (Avogadro’s Number), mole-mole (coefficients) Give two of the four conversions that can be made from a mole and the numbers used to make such conversions
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Dozen and mole are counting units, dozen=12, mole= 6.02 x 10 23 Explain the connection between a mole and a dozen. How are the similar and how do they differ?
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16 g/mol What is the molar mass of Oxygen?
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36.46 g/mol What is the molar mass of HCl?
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N 5 O 2 , 102.05 g/mol What is the molar mass of pentanitrogen dioxide?
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CuCl 2 , 134.45 g/mol What is the molar mass of copper (II) chloride?
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91.95 g/mol What is the molar mass of Fe(NH 4 ) 2 ?
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1:3; 1 mole N 2 : 3 mole H 2 N 2 + 3 H 2 ---> 2 NH 3 What is the mole ratio of N 2 to H 2 ?
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10 moles H 2 O 2 H 2 + O 2 ---> 2 H 2 O How many moles of H 2 O are produced when 5.00 moles of oxygen are used?
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162 L O 2 2 H 2 + O 2 ---> 2 H 2 O How many liters of O 2 will react with 14.5 moles of H 2 ?
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25.0 moles CO 2 Fe 2 O 3 + 3CO --> 2Fe + 3 CO 2 A student starts with 700. grams of CO, how many moles of CO 2 should be produced?
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125 grams SO 3 2 SO 2 + O 2 ---> 2 SO 3 A student starts with 100. grams of SO 2 , how many grams of SO 3 should be produced?
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3:2; 3 moles H 2 : 2 moles NH 3 N 2 + 3 H 2 ---> 2 NH 3 What is the mole ratio of H 2 to NH 3 ?
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1.50 moles O 2 2 H 2 + O 2 ---> 2 H 2 O If 3.00 moles of H 2 O are produced, how many moles of oxygen must be consumed
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10.3 moles NH 3 N 2 + 3 H 2 ---> 2 NH 3 How many moles of NH 3 will be produced if you start with 115 liters of N 2 ?
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678 grams CO 2 Fe 2 O 3 + 3CO --> 2Fe + 3 CO 2 A student starts with 15.4 moles of CO, how many grams of CO 2 should be produced?
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317 grams H 2 O 4 NH 3 + 3 O 2 --> 2 N 2 + 6 H 2 O A student starts with 200. grams of NH 3 , how many grams of H 2 O should be produced?
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Convert all reactants to one product, compare numbers, lowest number shows which is the limiting reactant How do you determine which reactant is the limiting reactant?
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O 2 limiting reactant, 0.0860 moles H 2 O C 3 H 8 + 5 O 2 3CO 2 + 4 H 2 O What is the theoretical yield of H 2 O in moles if you start with 14.8 g C 3 H 8 and 3.44 g O 2 ?
C 3 H 8
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0.555 moles C 3 H 8 + 5 O 2 3CO 2 + 4 H 2 O Given the following information, how many moles of the excess reactant is left over?
C 3 H 8 : 4.33 moles H 2 O O 2 : 2.11 moles H 2 O
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Subtract limiting product # from excess product #, convert this product number back to excess reactant How do you determine how much excess reactant is left over?
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4Al 2 Fe limiting reactant, 0.162 moles Al O 3 + 9Fe -> 3Fe 3 O 4 + 8Al What is the theoretical yield of Al in moles if you start with 25.4 g Al 2 O 3 and 10.2 g Fe?
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1.8 moles Fe 4Al 2 O 3 + 9Fe -> 3Fe 3 O 4 + 8Al Given the following information, how many moles of the excess reactant is left over?
Al 2 O 3 : 1.88 moles Al Fe: 3.48 moles Al
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Periodic table, determine the molar mass When making mole conversions concerning grams, how is conversion determined?
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Balanced equation When completing mole to mole conversions how are values determined?
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Avogadro’s number, 6.02 x 10 23 When completing mole conversions involving numbers of particles, how are values determined?
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Gas constant, 22.4 Liters When completing mole conversions involving gas stoichiometry, how are values determined?
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Back page of study guide Sketch out a flow chart of possible conversions involving moles.
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Units will cancel if opposite of each other, all units should cancel out besides desired unit, multiply top numbers and divide bottom numbers State one rule for making unit conversions.
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Dimensional Analysis What is the process of converting one unit to another unit called?
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