1 Convert the following a 0 214 g to amu b 9 53 x 1031 amu to g c 0 137 kg to amu 2014 Marcus Jennings 2 The two known isotopes of manganese are 54Mn and 56Mn Given that the average atomic mass of manganese is 54 938 amu calculate the percent abundance of each isotope 3 The element bromine has two known isotopes 79Br and 81Br If the percent abundance of Br 79 is 50 69 and the percent abundance of Br 81 is 49 31 what is the average atomic mass in amu 4 Calculate the following a The number of hydrogen atoms in one mole of water b The number of ammonia molecules in one mole of ammonia c The number of carbon atoms in one mole of glucose C6H12O6 d The number of water molecules in one mole of cupper II sulfate pentahydrate e The number of chlorine atoms in one mole iron III chloride 2014 Marcus Jennings 5 Convert the following to mass in grams a 6 78 x 1023 atoms of zinc b 4 39 x 1019 atoms of hydrogen c Three moles of carbon d 0 67 moles of lithium metal 2014 Marcus Jennings 6 Calculate the formula molecular mass of the following a NaHCO3 b Fluorine gas c N2O5 d Lithium bromide e O2 f Potassium hydroxide 2014 Marcus Jennings 7 Calculate the molar mass of the following a Glucose C6H12O6 b Co OH 3 c Ammonium carbonate d Ni NO3 2 e Sulfuric acid 2014 Marcus Jennings 8 Calculate the following percent compositions a C in CO2 b H in H2O c N in N2O5 d Na in NaHCO3 e S in sulfuric acid 2014 Marcus Jennings 9 Find the following masses in grams a Carbon in 12 36 g carbon dioxide b Hydrogen in 9 24 g of water c Nitrogen in 0 36 moles of dinitrogen pentoxide d Oxygen in 98 2 g of sulfuric acid e Lead in 0 58 moles of PbI2 2014 Marcus Jennings 10 Aspartame a compound used in artificial sweeteners is 6 165 H 57 135 C 9 519 N and 27 182 O by mass Calculate the empirical formula of aspartame 11 A substance is 57 10 C 4 79 H and 38 11 S by mass If the molecular weight of the substance is about 168 amu what is its molecular formula 2014 Marcus Jennings 12 A 6 38 g sample of an unknown compound containing carbon hydrogen and oxygen is burned in air to produce 9 35 g of carbon dioxide and 3 82 g of water What is the empirical formula of the substance If the compound s molecular mass is 180 2 amu what is the molecular formula Write a balanced chemical equation that represents this scenario 2014 Marcus Jennings 13 Write balanced chemical equations for the following situations a Propane is burned in air b Hydrogen peroxide decomposes into water and oxygen gas c Lithium metal is heated in nitrogen gas to produce lithium nitride 2014 Marcus Jennings and potassium nitrate sulfate d Solutions of lead II nitrate and potassium chloride are mixed to form lead II chloride e Zinc metal is placed in a solution of cupper II sulfate to form copper metal and zinc II 14 If 73 48 grams of propane react with 319 grams of oxygen gas what mass of water will be formed Assume the reaction goes to completion 15 If 23 5 grams of lithium react with 95 7 grams of nitrogen gas to form lithium nitride what mass of excess reagent remains 2014 Marcus Jennings 16 In an experiment 22 78 grams of hydrogen peroxide are placed under a bright light and the hydrogen peroxide decomposes completely If 9 33 grams of water are collected what is the percent yield for the reaction 2014 Marcus Jennings
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