CHEMISTRY-MASTERINGCHEMISTRY W/ETEXT
8th Edition
ISBN: 9780135204634
Author: Robinson
Publisher: PEARSON
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Chapter 3, Problem 3.97SP
Nitrogen fixation in the root nodules of peas and other leguminous plants is carried out by the molybdenum-contain ingenzyme nitrogenase. What is the molecular mass of nitrogenase if the enzyme contains two molybdenum atoms and is0.0872% Mo by mass?
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Nitrogen of ammonia can be determined by treatment of the sample with chloroplatinic acid; the
product is slightly soluble ammonium chloroplatinate:
H₂PtCl 6 + 2NH4+ → (NH4)2PtCl6 + 2H+
The precipitate decomposes on ignition, yielding metallic platinum and gaseous products:
(NH4)2PtCl6 3 → Pt(s) + 2Cl₂(g) + 2NH3(g)↑ + 2HCl(g)↑
Calculate the percentage of ammonia in a sample if 0.2115 g of the impure sample gave rise to
0.4693 g of platinum.
Given: M(NH3) = 17.0306 g/mol; M(Pt) = 195.08 g/mol.
O
O b. 14.25%
O
O d. 82.38%
a. 56.52%
c. 38.74%
Hematite, Fe203, is an important ore of iron. (An ore is a natural
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metal is obtained by reacting hematite with carbon monoxide, CO, in a
blast furnace. Carbon monoxide is formed in the furnace by partial
combustion of carbon. The reaction is
Fe203(s) + 3CO(g) → 2Fe(s) + 3CO2(g)
How many grams of iron can be produced from 1.17 kg Fe203?
g Fe
22. Copper is obtained from sulfide ores through a two-step process consisting
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D. 1.28 kg
Chapter 3 Solutions
CHEMISTRY-MASTERINGCHEMISTRY W/ETEXT
Ch. 3 - Prob. 3.1PCh. 3 - If blue spheres represent nitrogen atoms and red...Ch. 3 - Prob. 3.3PCh. 3 - APPLY 3.4 The major ingredient in ordinary safety...Ch. 3 - Calculate the molecular weight of sulfuric acid...Ch. 3 - Conceptual APPLY 3.6 Use the structural formula of...Ch. 3 - PRACTICE 3.7 How many moles arc in 5.26 g of...Ch. 3 - APPLY 3.8 When a diabetic experiences low blood...Ch. 3 - PRACTICE 3.9 Aspirin is prepared by reaction...Ch. 3 - APPLY 3.10 Refer to the balanced reaction for the...
Ch. 3 - PRACTICE 3.11 Ethyl alcohol is prepared...Ch. 3 - APPLY 3.12 (a) Diethyl ether (C4H10O), the “ether”...Ch. 3 - Conceptual PRACTICE 3.13 The following diagram...Ch. 3 - Conceptual APPLY 3.14 Draw a diagram similar to...Ch. 3 - Lithium oxide is used aboard the space shuttle to...Ch. 3 - APPLY 3.16 After lithium hydroxide is produced...Ch. 3 - PRACTICE 3.17 What is the empirical formula of the...Ch. 3 - Conceptual APPLY 3.19 Use the structural formula...Ch. 3 - PRACTICE 3.20 Menthol, a flavouring agent obtained...Ch. 3 - PRACTICE 321 Combustion analysis is performed on...Ch. 3 - PRACTICE 3.23 A compound has an empirical formula...Ch. 3 - APPLY 3.24 Combustion analysis was performed on...Ch. 3 - Prob. 3.23PCh. 3 - Match the terms percent yield and percent atom...Ch. 3 - Examine two reactions important in chemical...Ch. 3 - Propene is a raw material for a wide variety of...Ch. 3 - Ibuprofen (the active ingredient in the...Ch. 3 - The original synthesis for ibuprofen, developed in...Ch. 3 - The reaction of A (red spheres) with B (blue...Ch. 3 - The diagrams represent a reaction on the molecular...Ch. 3 - Fluoxetine, marketed as an antidepressant under...Ch. 3 - The following diagram represents the reaction of...Ch. 3 - What is the percent composition of cysteine, one...Ch. 3 - Cytosine, a constituent of deoxyribonucleic acid...Ch. 3 - A hydrocarbon of unknown formula CxHy was...Ch. 3 - Which of the following equations are balanced? (a)...Ch. 3 - Which of the following equations are balanced?...Ch. 3 - Balance the following equations: (a)...Ch. 3 - Balance the following equations: (a) The explosion...Ch. 3 - Balance the following equations: (a)...Ch. 3 - Balance the following equations:...Ch. 3 - Balance the following equations. (a)...Ch. 3 - Balance the following equations. (a) CO(...Ch. 3 - What are the molecular (formula) weights of the...Ch. 3 - What are the formulas of the following substances?...Ch. 3 - What are the molecular weights of the following...Ch. 3 - Prob. 3.47SPCh. 3 - How many grams are in a mole of each of the...Ch. 3 - Prob. 3.49SPCh. 3 - How many moles of ions are in 27.5 g of MgCl2?Ch. 3 - How many moles of anions are in 35.6 g of AlF3?Ch. 3 - What is the molecular weight of chloroform if...Ch. 3 - What is the molecular weight of cholesterol if...Ch. 3 - 3.52 Iron (II) sulfate, FeSO4, is prescribed for...Ch. 3 - Prob. 3.55SPCh. 3 - An average cup of coffee contains about 125 mg of...Ch. 3 - Prob. 3.57SPCh. 3 - A sample that weighs 25.12 g contains 6.0221023...Ch. 3 - Prob. 3.59SPCh. 3 - Prob. 3.60SPCh. 3 - Prob. 3.61SPCh. 3 - In the preparation of iron from hematite, Fe2O3...Ch. 3 - An alternative method for preparing pure iron from...Ch. 3 - Magnesium metal burns in oxygen to form...Ch. 3 - Ethylene gas, C2H4 , reacts with water at high...Ch. 3 - Prob. 3.66SPCh. 3 - Titanium dioxide (TiO2) , the substance used as...Ch. 3 - Prob. 3.68SPCh. 3 - Aluminum reacts with oxygen to yield aluminum...Ch. 3 - The industrial production of hydriodic acid takes...Ch. 3 - An alternative method for producing hydriodic acid...Ch. 3 - Nickel(II) sulfate, used for nickel plating, is...Ch. 3 - Hydrazine, N2H4 , once used as a rocket...Ch. 3 - Assume that you have 1.39 mol of H2 and 3.44 mol...Ch. 3 - Hydrogen and chlorine react to yield hydrogen...Ch. 3 - How many grams of the dry-cleaning solvent...Ch. 3 - How many grams of each product result from the...Ch. 3 - Limestone (CaCO3) reacts with hydrochloric acid...Ch. 3 - Sodium azide (NaN3) yields N2 gas when heated to...Ch. 3 - Acetic acid (CH3CO2H) reacts with isopentyl...Ch. 3 - Cisplatin [Pt( NH 3)2Cl2] , a compound used in...Ch. 3 - If 1.87 g of acetic acid (CH3COOH) reacts with...Ch. 3 - If 3.42 g of K2PtCl4 and 1.61 g of NH3 give 2.08 g...Ch. 3 - The reaction of tungsten hexachloride (WCl6) with...Ch. 3 - Sodium borohydride, NaBH4 , a substance used in...Ch. 3 - Urea, a substance commonly used as a fertilizer,...Ch. 3 - Calculate the mass percent composition of each of...Ch. 3 - What are the empirical formulas of substances with...Ch. 3 - Ferrocene, a substance proposed for use as a...Ch. 3 - What is the empirical formula of stannous...Ch. 3 - What are the empirical formulas of each of the...Ch. 3 - An unknown liquid is composed of 5.57% 11, 28.01 %...Ch. 3 - An unknown liquid is composed of 34.31% C, 5.28%...Ch. 3 - Combustion analysis of 45.62 mg of toluene, a...Ch. 3 - Coniine, a toxic substance isolated from poison...Ch. 3 - Cytochrome c is an iron—containing enzyme found in...Ch. 3 - Nitrogen fixation in the root nodules of peas and...Ch. 3 - Disilane, Si2Hx, is analyzed and found to contain...Ch. 3 - A certain metal sulfide, MS2, is used extensively...Ch. 3 - Combustion analysis of a 31.472 mg sample of the...Ch. 3 - The stimulant amphetamine contains only carbon,...Ch. 3 - Prob. 3.102SPCh. 3 - Prob. 3.103SPCh. 3 - Prob. 3.104SPCh. 3 - Prob. 3.105SPCh. 3 - Prob. 3.106SPCh. 3 - Prob. 3.107SPCh. 3 - Prob. 3.108MPCh. 3 - The molar mass of HCl is 36.5 g/mol, and the...Ch. 3 - Assume that gasoline has the formula C8H18 and has...Ch. 3 - Compound X contains only carbon, hydrogen,...Ch. 3 - Prob. 3.112MPCh. 3 - A certain alcoholic beverage contains only ethanol...Ch. 3 - A mixture of FeO and Fe2O3 with a mass of 10.0 g...Ch. 3 - Prob. 3.115MPCh. 3 - When eaten, dietary carbohydrates are digested to...Ch. 3 - Prob. 3.117MPCh. 3 - Prob. 3.118MPCh. 3 - A mixture of XCl3 and XCl5 weighing 10.00 g...Ch. 3 - Ammonium nitrate, a potential ingredient of...Ch. 3 - Window glass is typically made by mixing soda ash...Ch. 3 - Prob. 3.122MPCh. 3 - Ethylene glycol, commonly used as automobile...Ch. 3 - Prob. 3.124MP
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