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1, 2 and 4

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Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter3: Chemical Reactions
Section: Chapter Questions
Problem 65QRT
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1, 2 and 4

1. Stibnite, Sb;S1, is a dark gray mineral from which antimony metal is obtained. What is the mass percent of antimony in the sulfide? If you have 1.00 kg of an ore that contains 10.6% antimony, what mass of Sb;S3 (in grams) is in the ore? 2. Nicotine, a poisonous compound found in tobacco leaves, is 74.0 % C, 8.65 % H, and 17.35% N. Its molar mass is 162 g/mol. What are the empirical and molecular formulas of nicotine? 3. Balance the reaction of sodium hydroxide and iron(II) chloride to give iron(1I) hydroxide and sodium chloride, and then write the net ionic equation. Show states for all reactants and products (s, C, g, aq). 4. The "alum" used in cooking is potassium aluminum sulfate hydrate, KAI(SO.): x H20. To find the value of x, you can heat a sample of the compound to drive off all of the water and leave only KAl(SO.)2. Assume you heat 4.74 g of the hydrated compound and that the sample loses 2.16 g of water. What is the value of x?
Transcribed Image Text:1. Stibnite, Sb;S1, is a dark gray mineral from which antimony metal is obtained. What is the mass percent of antimony in the sulfide? If you have 1.00 kg of an ore that contains 10.6% antimony, what mass of Sb;S3 (in grams) is in the ore? 2. Nicotine, a poisonous compound found in tobacco leaves, is 74.0 % C, 8.65 % H, and 17.35% N. Its molar mass is 162 g/mol. What are the empirical and molecular formulas of nicotine? 3. Balance the reaction of sodium hydroxide and iron(II) chloride to give iron(1I) hydroxide and sodium chloride, and then write the net ionic equation. Show states for all reactants and products (s, C, g, aq). 4. The "alum" used in cooking is potassium aluminum sulfate hydrate, KAI(SO.): x H20. To find the value of x, you can heat a sample of the compound to drive off all of the water and leave only KAl(SO.)2. Assume you heat 4.74 g of the hydrated compound and that the sample loses 2.16 g of water. What is the value of x?
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