Chemistry: Principles and Reactions
8th Edition
ISBN: 9781305079373
Author: William L. Masterton, Cecile N. Hurley
Publisher: Cengage Learning
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Textbook Question
Chapter 20, Problem 35QAP
Using data in Appendix 1, estimate the temperature at which Fe2O3 can be reduced to iron, using hydrogen gas as a reducing agent (assume H2O(g) is the other product).
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Chemistry: Principles and Reactions
Ch. 20 - Write a balanced equation to represent the...Ch. 20 - Write a balanced equation to represent the...Ch. 20 - Write a balanced equation to represent (a) the...Ch. 20 - Prob. 4QAPCh. 20 - Prob. 5QAPCh. 20 - Prob. 6QAPCh. 20 - Prob. 7QAPCh. 20 - Prob. 8QAPCh. 20 - Prob. 9QAPCh. 20 - Zinc is produced by electrolytic refining. The...
Ch. 20 - Prob. 11QAPCh. 20 - Prob. 12QAPCh. 20 - Prob. 13QAPCh. 20 - Prob. 14QAPCh. 20 - Prob. 15QAPCh. 20 - Prob. 16QAPCh. 20 - To inflate a life raft with hydrogen to a volume...Ch. 20 - What mass of KO2 is required to remove 90.0% of...Ch. 20 - Prob. 19QAPCh. 20 - Prob. 20QAPCh. 20 - Prob. 21QAPCh. 20 - Prob. 22QAPCh. 20 - Balance the following redox equations. (a)...Ch. 20 - Balance the following redox equations. (a)...Ch. 20 - Prob. 25QAPCh. 20 - Prob. 26QAPCh. 20 - Prob. 27QAPCh. 20 - Using Table 17.1 (Chapter 17) calculate E° for (a)...Ch. 20 - Using Table 20.4, calculate, for the...Ch. 20 - Prob. 30QAPCh. 20 - Prob. 31QAPCh. 20 - Prob. 32QAPCh. 20 - Prob. 33QAPCh. 20 - The equilibrium constant for the reaction...Ch. 20 - Using data in Appendix 1, estimate the temperature...Ch. 20 - A 0.500-g sample of zinc-copper alloy was treated...Ch. 20 - Prob. 37QAPCh. 20 - Prob. 38QAPCh. 20 - Iron(II) can be oxidized to iron(III) by...Ch. 20 - Prob. 40QAPCh. 20 - Prob. 41QAPCh. 20 - Rust, which you can take to be Fe(OH)3, can be...Ch. 20 - Prob. 43QAPCh. 20 - Prob. 44QAPCh. 20 - Prob. 45QAP
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- Use data from Appendix J to calculate the enthalpy change and the Gibbs free energy change for the reduction of chromium(III) oxide by aluminum.arrow_forwardIn the commercial preparation of aluminum, aluminum oxide, Al2O3, is electrolyzed at 1000C. (The mineral cryolite is added as a solvent.) Assume that the cathode reaction is Al3+3eAl How many coulombs of electricity are required to give 3.9 kg of aluminum?arrow_forwardIn an analytical determination of arsenic, a solution containing arsenious acid, H3AsO3, potassium iodide, and a small amount of starch is electrolyzed. The electrolysis produces free iodine from iodide ion, and the iodine immediately oxidizes the arsenious acid to hydrogen arsenate ion, HAsO42. I2(aq)+H3AsO3(aq)+H2O(l)2I(aq)+HAsO42(aq)+4H+(aq) When the oxidation of arsenic is complete, the free iodine combines with the starch to give a deep blue color. If, during a particular run, it takes 65.4 s for a current of 10.5 mA to give an endpoint (indicated by the blue color), how many grams of arsenic are present in the solution?arrow_forward
- Calcium metal can be obtained by the direct electrolysis of molten CaCl2, at a voltage of 3.2 V. (a) How many joules of electrical energy are required to obtain 12.0 1b of calcium? (b) What is the cost of the electrical energy obtained in (a) if electrical energy is sold at the rate of nine cents per kilowatt hour?arrow_forwardHydrazine, N2H4, has been proposed as the fuel in a fuel cell in which oxygen is the oxidizing agent. The reactions are N2H4(aq) + 4 OH(aq) N2(g) + 4 H2O() + 4e O2(g) + 2 H2O() + 4e 4 OH(aq) (a) Which reaction occurs at the anode and which at thecathode? (b) What is the overall cell reaction? (c) If the cell is to produce 0.50 A of current for 50.0 h, calculate what mass in grams of hydrazine must be present. (d) Calculate what mass (g) of O2 must be available to reactwith the mass of N2H4 determined in part (c).arrow_forwardWhen carbon dioxide dissolves in water it reacts to produce carbonic acid, H2CO3(aq), which can ionize in two steps. H2CO3(aq)HCO3(aq)+H+(aq)Kc1=4.2107HCO3(aq)CO32(aq)+H+(aq)Kc2=4.81011 Calculate the equilibrium constant for the reaction H2CO3(aq)CO32(aq)+2H+(aq)arrow_forward
- A constant current of 1.25 amp is passed through an electrolytic cell containing a 0.050 M solution of CuSO4 and a copper anode and a platinum cathode until 3.00 g of copper is deposited. a How long does the current flow to obtain this deposit? b What mass of silver would be deposited in a similar cell containing 0.15 M Ag+ if the same amount of current were used?arrow_forwardAluminum is produced commercially by the electrolysis of Al2O3 in the presence of a molten salt. If a plant has a continuous capacity of 1.00 million A, what mass of aluminum can be produced in 2.00 h?arrow_forwardComparing the chemistry of carbon and silicon. (a) Write balanced chemical equations for the reactions of H2O() with CH4 (forming CO2 and H2) and SiH4 (forming SiO2 and H2). (b) Using thermodynamic data, calculate the standard free energy change for the reactions in (a). Is either reaction product-favored at equilibrium? (c) Look up the electronegativities of carbon, silicon, and hydrogen. What conclusion can you draw concerning the polarity of CH and SiH bonds? (d) Carbon and silicon compounds with the formulas (CH3)2CO (acetone) and [(CH3)2SiO]n (a silicone polymer) also have quite different structures. Draw Lewis structures for these species. This difference, along with the difference between structures of CO2 and SiO2, suggests a general observation about silicon compounds. Based on that observation, do you expect that a silicon compound with a structure similar to ethene (C2H4) exists?arrow_forward
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