1411.Worksheets.Chpt3 - Chapter 3 Worksheet Determining...

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Unformatted text preview: Chapter 3 Worksheet Determining Formulas The combustion of 12.71 grams of a compound which contains only CH and Cl yields 27.85 grams of CO: and 12.35 grams of H20. What is the empirical formula of the compound? A chemical compound was found to contain only Fe. C, and H. When 5.00 g of this compound was completely burned in 0?. 9.1 g of CO: and 1.80 g of H20 were produced. Find the percentage by mass of each element in the original compound and its empirical formula. . A sample of compound contains 63.11 9 carbon, 11.9 9 hydrogen and 24.97 g fluorine. Determine the empirical formula. . Determine the empirical formula of a compound for which the mass composition is given as: 56.58% potassium. 8.69% carbon, and 34.73% oxygen . The molecular mass of a compound is 540 glmole. Its composition is given as: 19.93% carbon. 2.215% hydrogen and 77.855% chlorine. Determine the empirical and the molecular formula. . A 2.00 9 sample of beryllium metal is burned in an oxygen atmosphere to produce 5.55 g of a beryllium-oxygen compound. Determine the compounds empirical formula. Lactic acid. the substance that builds up in muscles and causes them to "hurt" when they are worked hard, has a molecular mass of 90.0 amu and a percent composition by mass of 40.0% C. 6.71% H and 53.3% 0. Determine the molecular formula of lactic acid. Chapter 3 Worksheet Stoichiometry 1) Iron and oxygen combine to form several types of iron oxide (rust). One type is formed by the following 2) 3) reaction: Fe{s) + 02(9) —r Fe203(s) :1) How many moles of oxygen are needed to react with 37 moles of iron? b) How many grams of iron(lil)oxide can be formed from 8.02 moles of iron? cl How many grams of oxygen are needed to prepare 124 g of iron(lll)oxide? d) A cube of iron with an edge length of 5.00 m is exposed to oxygen only on one face. If the radius of an iron atom is 124 pm. how many moles of oxygen are required to convert one face to iron(lll)oxide? (Hint: Area of a circte a = n r?) A different type of iron oxide. Fe30t. magnetite, can be formed by reacting superheated steam with iron: Fe(s) + H:0(g) —-> Fe30¢(s) + “2(9) :1) How many moles of magnetite can be formed from the reaction of 67 mol iron and 78 mol water? b) How many grams of magnetite can be formed from 53.2 9 iron and 20.0 g water? c) How many grams of hydrogen are formed when 181 g of iron and 54.1 g of water react? Zinc metal is produced from its principal ore. mainly zinc sulfide. by the following two step process: Znsls) + 02(9) Zn0(s) + C(s) ———> ans) + 60(9) ——> Zn0(s) + 502(9) a) How many kilograms of oxygen are needed to prepare 1.00 x 103 g of zinc? b} How many grams of lay-products (sulfur dioxide + carbon monoxide) are formed from the processing of 600.0 g of zinc sulfide? (Assume excess oxygen and carbon.) c} Assuming 91.5% percent yield for the production of zinc oxide in the first reaction and 78.1% for the production of zinc in the second reaction. how many grams of zinc are obtained from the reaction of 20.0 kg of zinc sulfide and 50.0 kg of oxygen? (Assume excess carbon.) 4) A reaction of PE; with P205 produces only one product, POBrg. How many grams of Post} can be prepared from the reaction of2.58 g of PBrg. and 8.94 g of P305? a) Hydrogen sulfide bums in oxygen to form sulfur dioxide and water by the reaction: 2HES + 302 — p 280: + ZHEO How many grams of hydrogen sulfide must react in order to produce a total of 100.0 g of products? 6) What is the percent yield for a chemical reaction in which 10.0 g of magnesium reacts with excess hydrochloric acid to produce magnesium chloride and 6.98 L of hydrogen gas (H2) which has a density of 0.090 git. ? ...
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This note was uploaded on 02/13/2011 for the course CHEM 2300 taught by Professor Drbean during the Spring '10 term at University of Houston.

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1411.Worksheets.Chpt3 - Chapter 3 Worksheet Determining...

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