EBK CHEMISTRY
8th Edition
ISBN: 9780135216972
Author: Robinson
Publisher: PEARSON CO
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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%
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c. 38.74%
Hematite, Fe203, is an important ore of iron. (An ore is a natural
substance from which the metal can be profitably obtained.) The free
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
of roasting the ore in the presence of oxygen and heating the resultant copper(I)
oxide with powdered carbon. The overall reaction is as follows:
2Cu2S (s) + 302 (g) + 2C (s) → 2SO2 (g) + 4Cu (s) + 2CO (g)
Calculate the maximum yield of copper obtained from 1.60 kg of Cu2S.
(Relative atomic mass: S, 32; O, 16; C, 12; Cu, 64)
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С. 0.96 kg
D. 1.28 kg
Chapter 3 Solutions
EBK CHEMISTRY
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