Problem 3.1QP: What is the difference between a formula weight and a molecular weight? Could a given substance have... Problem 3.2QP: Describe in words how to obtain the formula weight of a compound from the formula. Problem 3.3QP: One mole of N2 contains how many N2 molecules? How many N atoms are there in one mole of N2? One... Problem 3.4QP Problem 3.5QP Problem 3.6QP: A substance has the molecular formula C6H12O2. What is its empirical formula? Problem 3.7QP: Hydrogen peroxide has the empirical formula HO and an empirical formula weight of 17.0 amu. If the... Problem 3.8QP: Describe in words the meaning of the equation CH4+2O2CO2+2H2O using a molecular, a molar, and then a... Problem 3.9QP Problem 3.10QP Problem 3.11QP Problem 3.12QP Problem 3.13QP: How many grams of NH3 will have the same number of molecules as 15.0 g of C6H6? a 3.27 b 1.92 c 15.0... Problem 3.14QP: Which of the following has the largest number of molecules? a 1 g of benzene, C6H6 b l g of... Problem 3.15QP: How many atoms are present in 123 g of magnesium cyanide? a 9.7 1023 b 2.91 1024 c 2.83 1028 d... Problem 3.16QP: Calculations with Chemical Formulas and Equations When 2.56 g of a compound containing only carbon,... Problem 3.17QP Problem 3.18QP: Moles within Moles and Molar Mass Part 1: a How many hydrogen and oxygen atoms are present in 1... Problem 3.19QP: You react nitrogen and hydrogen in a container to produce ammonia, NH3(g). The following figure... Problem 3.20QP: Propane, C3H8, is the fuel of choice in a gas barbecue. When burning, the balanced equation is... Problem 3.21QP Problem 3.22QP Problem 3.23QP: High cost and limited availability of a reactant often dictate which reactant is limiting in a... Problem 3.24QP Problem 3.25QP: A friend asks if you would be willing to check several homework problems to see if she is on the... Problem 3.26QP Problem 3.27QP: Find the formula weights of the following substances to three significant figures. a formaldehyde,... Problem 3.28QP: Find the formula weights of the following substances to three significant figures. a sulfuric acid,... Problem 3.29QP: Calculate the formula weight of the following molecules to three significant figures. Problem 3.30QP: Calculate the formula weight of the following molecules to three significant figures. Problem 3.31QP: Ammonium nitrate, NH4NO3, is used as a nitrogen fertilizer and in explosives. What is the molar mass... Problem 3.32QP: Phosphoric acid, H3PO4, is used to make phosphate fertilizers and detergents and is also used in... Problem 3.33QP: Calculate the mass (in grams) of each of the following species. a Ar atom b Te atom c PBr3, molecule... Problem 3.35QP: Diethyl ether, (C2H5)2O, commonly known as ether, is used as an anesthetic. What is the mass in... Problem 3.36QP: Glycerol, C3H8O3, is used as a moistening agent for candy and is the starting material for... Problem 3.37QP: Calculate the mass in grams of the following. a 0.15 mol Na b 0.594 mol S c 2.78 mol CH2Cl2 d 38 mol... Problem 3.38QP: Calculate the mass in grams of the following. a 0.331 mol Fe b 2.1 mol F c 0.034 mol CO2 d 1.89 mol... Problem 3.39QP: Boric acid, H3BO3, is a mild antiseptic and is often used as an eyewash. A sample contains 0.543 mol... Problem 3.40QP: Carbon disulfide, CS2, is a colorless, highly flammable liquid used in the manufacture of rayon and... Problem 3.41QP: Obtain the moles of substance in the following. a 7.17 g C b 4.02 g Cl2 c 78 g C4H10 d 73.5 g... Problem 3.42QP: Obtain the moles of substance in the following. a 2.57 g As b 7.83 g S8 c 33.8 g N2H4 d 227 g... Problem 3.43QP: Calcium sulfate, CaSO4, is a white, crystalline powder. Gypsum is a mineral, or natural substance,... Problem 3.44QP: A 1.547-g sample of blue copper(II) sulfate pentahydrate, CuSO4 5H2O, is heated carefully to drive... Problem 3.45QP: Calculate the following. a number of atoms in 8.21 g Li b number of atoms in 32.0 g Br2 c number of... Problem 3.46QP: Calculate the following. a number of atoms in 25.7 g Al b number of atoms in 5.66 g I2 c number of... Problem 3.47QP: Carbon tetrachloride is a colorless liquid used in the manufacture of fluorocarbons and as an... Problem 3.48QP: Chlorine trifluoride is a colorless, reactive gas used in nuclear fuel reprocessing. How many... Problem 3.49QP: A 1.680-g sample of coal contains 1.584 g C. Calculate the mass percentage of C in the coal. Problem 3.50QP: A 6.01-g aqueous solution of isopropyl alcohol contains 3.67 g of isopropyl alcohol. What is the... Problem 3.51QP: Phosphorus oxychloride is the starting compound for preparing substances used as flame retardants... Problem 3.52QP: Ethyl mercaptan is an odorous substance added to natural gas to make leaks easily detectable. A... Problem 3.53QP: A fertilizer is advertised as containing 14.0% nitrogen (by mass). How much nitrogen is there in... Problem 3.54QP: Seawater contains 0.0065% (by mass) of bromine. How many grams of bromine are there in 2.50 L of... Problem 3.55QP: A sample of an alloy of aluminum contains 0.0898 mol Al and 0.0381 mol Mg. What are the mass... Problem 3.56QP: A sample of gas mixture from a neon sign contains 0.0856 mol Ne and 0.0254 mol Kr. What are the mass... Problem 3.57QP: Calculate the percentage composition for each of the following compounds (three significant... Problem 3.58QP: Calculate the percentage composition for each of the following compounds (three significant... Problem 3.59QP: Calculate the mass percentage of each element in toluene, represented by the following molecular... Problem 3.60QP: Calculate the mass percentage of each element in 2-propanol, represented by the following molecular... Problem 3.61QP: Which contains more carbon, 6.01 g of glucose. C6H12O6, or 5.85 g of ethanol, C2H5O? Problem 3.62QP: Which contains more sulfur, 40.8 g of calcium sulfate, CaSO4, or 38.8 g of sodium sulfite, Na2SO3? Problem 3.63QP: Ethylene glycol is used as an automobile antifreeze and in the manufacture of polyester fibers. The... Problem 3.64QP Problem 3.65QP: An oxide of osmium (symbol Os) is a pale yellow solid. If 2.89 g of the compound contains 2.16 g of... Problem 3.66QP: An oxide of tungsten (symbol W) is a bright yellow solid. If 5.34 g of the compound contains 4.23 g... Problem 3.67QP: Potassium bromate is a colorless, crystalline substance whose composition is 23.4% K, 47.8% Br, and... Problem 3.68QP: Hydroquinone, used as a photographic developer, is 65.4% C, 5.5% H, and 29.1% O, by mass. What is... Problem 3.69QP: Acrylic acid, used in the manufacture of acrylic plastics, has the composition 50.0% C, 5.6% H, and... Problem 3.70QP: Malonic acid is used in the manufacture of barbiturates (sleeping pills). The composition of the... Problem 3.71QP: Two compounds have the same composition: 92.25% C and 7.75% H. a Obtain the empirical formula... Problem 3.72QP: Two compounds have the same composition: 85.62% C and 14.38% H. a Obtain the empirical formula... Problem 3.73QP: Putreseine a substance produced by decaying animals, has the empirical formula C2H6N. Several... Problem 3.74QP: Compounds of boron with hydrogen are called boranes. One of these boranes has the empirical formula... Problem 3.75QP: Oxalic acid is a toxic substance used by laundries to remove rust stains. Its composition is 26.7%... Problem 3.76QP: Adipic acid is used in the manufacture of nylon. The composition of the acid is 49.3% C, 6.9% H, and... Problem 3.77QP: Ethylene, C2H4, bums in oxygen to give carbon dioxide, CO2, and water. Write the equation for the... Problem 3.78QP: Hydrogen sulfide gas, H2S, burns in oxygen to give sulfur dioxide. SO2, and water. Write the... Problem 3.79QP Problem 3.80QP: Ethanol, C2H5OH, burns with the oxygen in air to give carbon dioxide and water.... Problem 3.81QP: Iron in the form of fine wire burns in oxygen to form iron(III) oxide. 4Fe(s)+3O2(g)2Fe2O3(s) How... Problem 3.82QP Problem 3.83QP: Nitric acid, HNO3, is manufactured by the Ostwald process, in which nitrogen dioxide, NO2, reacts... Problem 3.84QP: White phosphorus, P4, is prepared by fusing calcium phosphate, Ca3(PO4)2, with carbon, C, and sand,... Problem 3.85QP: Tungsten metal, W, is used to make incandescent bulb filaments. The metal is produced from the... Problem 3.86QP: Acrylonitrile, C3H3N, is the starting material for the production of a kind of synthetic fiber... Problem 3.87QP: The following reaction, depicted using molecular models, is used to make carbon tetrachloride, CCl4,... Problem 3.88QP: Using the following reaction (depicted using molecular models), large quantities of ammonia are... Problem 3.89QP: When dinitrogen pentoxide, N2O5, a white solid, is heated, it decomposes to nitrogen dioxide and... Problem 3.90QP: Copper metal reacts with mine acid. Assume that the reaction is... Problem 3.91QP: Potassium superoxide, KO2, is used in rebreathing gas masks to generate oxygen.... Problem 3.92QP: Solutions of sodium hypochlorite, NaClO, are sold as a bleach (such as Clorox). They are prepared by... Problem 3.93QP: Methanol, CH3OH, is prepared industrially from the gas-phase catalytic balanced reaction that has... Problem 3.94QP: Carbon disulfide, CS2, burns in oxygen. Complete combustion gives the balanced reaction that has... Problem 3.95QP Problem 3.96QP: Hydrogen cyanide, HCN, is prepared from ammonia, air, and natural gas (CH4) by the following... Problem 3.97QP: Aspirin (acetylsalicylic acid) is prepared by heating salicylic acid, C7H6O3, with acetic anhydride,... Problem 3.98QP: Methyl salicylate (oil of wintergreen) is prepared by heating salicylic acid, C7H6O3, with methanol,... Problem 3.99QP: Caffeine, the stimulant in coffee and tea, has the molecular formula C8H10N4O2. Calculate the mass... Problem 3.100QP: Morphine, a narcotic substance obtained from opium, has the molecular formula C17H19NO3. What is the... Problem 3.101QP: A moth repellent, para-dichlorobenzene, has the composition 49.1% C, 2.7% H, and 48.2% Cl. Its... Problem 3.102QP: Sorbic acid is added to food as a mold inhibitor. Its composition is 64.3% C, 7.2% H. and 28.5% O,... Problem 3.103QP: Thiophene is a liquid compound of the elements C, H, and S. A sample of thiophene weighing 7.96 mg... Problem 3.104QP: Aniline, a starting compound for urethane plastic foams, consists of C, H, and N. Combustion of such... Problem 3.105QP: A sample of limestone (containing calcium carbonate, CaCO3) weighing 438 mg is treated with oxalic... Problem 3.106QP: A titanium ore contains rutile (TiO2) plus some iron oxide and silica. When it is heated with carbon... Problem 3.107QP: Ethylene oxide, C2H4O, is made by the oxidation of ethylene, C2H4. 2C2H4(g)+O2(g)2C2H4O(g) Ethylene... Problem 3.108QP: Nitrobenzene, C6H5NO2, an important raw material for the dye industry, is prepared from benzene,... Problem 3.109QP: Zinc metal can be obtained from zinc oxide, ZnO, by reaction at high temperature with carbon... Problem 3.110QP: Hydrogen cyanide, HCN, can be made by a two-step process. First, ammonia is reacted with O2 to give... Problem 3.111QP: Calcium carbide, CaC2, used to produce acetylene, C2H2, is prepared by heating calcium oxide, CaO,... Problem 3.112QP: A mixture consisting of 11.9 g of calcium fluoride, CaF2, and 12.1 g of sulfuric acid, H2SO4, is... Problem 3.113QP: Alloys, or metallic mixtures, of mercury with another metal are called amalgams. Sodium in sodium... Problem 3.114QP: A sample of sandstone consists of silica, SiO2, and calcite, CaCO3. When the sandstone is heated,... Problem 3.115QP Problem 3.116QP Problem 3.117QP: Exactly 4.0 g of hydrogen gas combines with 32 g of oxygen gas according to the following reaction.... Problem 3.118QP: Aluminum metal reacts with iron(III) oxide to produce aluminum oxide and iron metal. a How many... Problem 3.119QP Problem 3.120QP: You perform a combustion analysis on a 255 mg sample of a substance that contains only C, H, and O,... Problem 3.121QP Problem 3.122QP: A 3.0-L sample of paint that has a density of 4.65g/mL is found to contain 33.1 g Pb3N2(s). How many... Problem 3.123QP: A 12.1-g sample of Na2SO3 is mixed with a 14.6-g sample of MgSO4. What is the total mass of oxygen... Problem 3.124QP: Potassium superoxide, KO2, is employed in a self-contained breathing apparatus used by emergency... Problem 3.125QP: Calcium carbonate is a common ingredient in stomach antacids. If an antacid tablet has 68.4 mg of... Problem 3.126QP Problem 3.127QP Problem 3.128QP: Copper reacts with nitric acid according to the following reaction.... Problem 3.129QP: A sample of methane gas, CH4(g), is reacted with oxygen gas to produce carbon dioxide and water. If... Problem 3.130QP: A sample containing only boron and fluorine was decomposed yielding 4.75 mg of boron and 17.5 mL of... Problem 3.131QP Problem 3.132QP Problem 3.133QP: A 0.500-g mixture of Cu2O and CuO contains 0.425 g Cu. What is the mass of CuO in the mixture? Problem 3.134QP: A mixture of Fe2O3, and FeO was found to contain 72.00% Fe by mass. What is the mass of Fe2O3 in... Problem 3.135QP: Hemoglobin is the oxygen-carrying molecule of red blood cells, consisting of a protein and a... Problem 3.136QP: Penicillin V was treated chemically to convert sulfur to barium sulfate, BaSO4. An 8.19-mg sample of... Problem 3.137QP: A 3.41-g sample of a metallic element, M, reacts completely with 0.0158 mol of a gas, X2, to form... Problem 3.138QP Problem 3.139QP: An alloy of iron (54.7%), nickel (45.0%), and manganese (0.3%) has a density of 8.17 g/cm3. How many... Problem 3.140QP Problem 3.141QP: A power plant is driven by the combustion of a complex fossil fuel having the formula C11H7S. Assume... format_list_bulleted
