Chemistry: Principles and Reactions
8th Edition
ISBN: 9781305079373
Author: William L. Masterton, Cecile N. Hurley
Publisher: Cengage Learning
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Question
Chapter 21, Problem 72QAP
Interpretation Introduction
Interpretation:
The cost of HF needed to extract gold from the given reaction needs to be compared with the cost of gold formed.
Concept introduction:
Quartz is used to extract gold with HF. Here, the reaction between HF and quartz forms silicon tetrafluoride and water. The balance
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Chemistry: Principles and Reactions
Ch. 21 - Prob. 1QAPCh. 21 - Prob. 2QAPCh. 21 - Prob. 3QAPCh. 21 - Prob. 4QAPCh. 21 - Prob. 5QAPCh. 21 - Prob. 6QAPCh. 21 - Give the formula for the acidic oxide of (a) HNO3...Ch. 21 - Prob. 8QAPCh. 21 - Write the formulas of the following compounds. (a)...Ch. 21 - Prob. 10QAP
Ch. 21 - Prob. 11QAPCh. 21 - Prob. 12QAPCh. 21 - Prob. 13QAPCh. 21 - Prob. 14QAPCh. 21 - Prob. 15QAPCh. 21 - Prob. 16QAPCh. 21 - Prob. 17QAPCh. 21 - Write a balanced net ionic equation for the...Ch. 21 - Prob. 19QAPCh. 21 - Prob. 20QAPCh. 21 - Prob. 21QAPCh. 21 - Prob. 22QAPCh. 21 - Prob. 23QAPCh. 21 - Prob. 24QAPCh. 21 - Prob. 25QAPCh. 21 - Prob. 26QAPCh. 21 - Prob. 27QAPCh. 21 - Prob. 28QAPCh. 21 - Prob. 29QAPCh. 21 - Prob. 30QAPCh. 21 - Prob. 31QAPCh. 21 - Prob. 32QAPCh. 21 - Prob. 33QAPCh. 21 - Prob. 34QAPCh. 21 - The average concentration of bromine (as bromide)...Ch. 21 - Prob. 36QAPCh. 21 - Iodine can be prepared by allowing an aqueous...Ch. 21 - Prob. 38QAPCh. 21 - Prob. 39QAPCh. 21 - Prob. 40QAPCh. 21 - Prob. 41QAPCh. 21 - Prob. 42QAPCh. 21 - Prob. 43QAPCh. 21 - Prob. 44QAPCh. 21 - Prob. 45QAPCh. 21 - Given...Ch. 21 - What is the concentration of fluoride ion in a...Ch. 21 - Calculate the solubility in grams per 100 mL of...Ch. 21 - Prob. 49QAPCh. 21 - Follow the directions for Problem 49 for the...Ch. 21 - Consider the equilibrium system HF(aq)H+(aq)+F(aq)...Ch. 21 - Applying the tables in Appendix 1 to...Ch. 21 - Consider the reaction 4NH3(g)+5O2(g)4NO(g)+6H2O(g)...Ch. 21 - Data are given in Appendix 1 for white phosphorus,...Ch. 21 - Prob. 55QAPCh. 21 - Prob. 56QAPCh. 21 - Sodium hypochlorite is produced by the...Ch. 21 - Prob. 58QAPCh. 21 - Prob. 59QAPCh. 21 - Prob. 60QAPCh. 21 - Consider the reduction of nitrate ion in acidic...Ch. 21 - Prob. 62QAPCh. 21 - Choose the strongest acid from each group. (a)...Ch. 21 - Prob. 64QAPCh. 21 - Prob. 65QAPCh. 21 - Prob. 66QAPCh. 21 - Prob. 67QAPCh. 21 - Prob. 68QAPCh. 21 - Prob. 69QAPCh. 21 - Explain why (a) acid strength increases as the...Ch. 21 - Prob. 71QAPCh. 21 - Prob. 72QAPCh. 21 - The amount of sodium hypochlorite in a bleach...Ch. 21 - Prob. 74QAP
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- Three reactions very important to the semiconductor industry are The reduction of silicon dioxide to crude silicon, SiO2(s) + 2 C(s) → Si(s) + 2 CO(g) ΔrH° = 689.9 kJ/mol The formation of silicon tetrachloride from crude silicon, Si(s) + 2 Cl2(g) → SiCl4(g) ΔrH° = −657.01 kJ/mol The reduction of silicon tetrachloride to pure silicon with magnesium, SiCl4(g) + 2 Mg(s) → 2 MgCl2(s) + Si(s) ΔrH° = −625.6 kJ/mol Calculate the overall enthalpy change when 1.00 mol sand, SiO2, changes into very pure silicon by this series of reactions.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_forwardAssume that the radius of Earth is 6400 km, the crust is 50. km thick, the density of the crust is 3.5 g/cm3, and 25.7% of the crust is silicon by mass. Calculate the total mass of silicon in the crust of Earth.arrow_forward
- Phosphorus occurs naturally in the form of fluorapatite, CaF2 3Ca3(PO4)2. The dot indicates 1 part CaF2 to 3 parts Ca3(PO4)2. This mineral is reacted with an aqueous solution of H2SO4 in the preparation of a fertilizer. The products are phosphoric acid, hydrogen fluoride, and gypsum, CaSO4 2H2O. Write the balanced equation describing this process.arrow_forwardSulfuric acid can be prepared starting with the sulfide ore, cuprite (Cu2S). If each S atom in Cu2S leads to one molecule of H2SO4, what is the theoretical yield of H2SO4 from 3.00 kg of Cu2S?arrow_forward
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