3. Elements 5B and H react to make a binary compound B.Hy with 22 % by mass of H. A) Find the empirical formula of the compound: The mass of H atoms in 100 grams of the compound is The number of moles of 1H atoms in 100 grams of the compound is mol The mass of 5B atoms in 100 grams of the compound is g The number of moles of 5B atoms in 100 grams of the compound is mol The empirical formula is: (show work) B) The molar mass of the compound is 27.67 g/mol. Find its chemical formula:

3. Elements 5B and H react to make a binary compound B.Hy with 22 % by mass of H. A) Find the empirical formula of the compound: The mass of H atoms in 100 grams of the compound is The number of moles of 1H atoms in 100 grams of the compound is mol The mass of 5B atoms in 100 grams of the compound is g The number of moles of 5B atoms in 100 grams of the compound is mol The empirical formula is: (show work) B) The molar mass of the compound is 27.67 g/mol. Find its chemical formula:

Introductory Chemistry: A Foundation

9th Edition

ISBN:9781337399425

Author:Steven S. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Donald J. DeCoste

Chapter9: Chemical Quantities

Section: Chapter Questions

Problem 80AP: Using the average atomic masses given inside the front cover of the text, calculate the mass in...

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Consider the following diagram, where atom X is represented by a square and atom Y is represented by a circle. (a) Write the equation for the reaction represented by the diagram. (b) If each circle stands for a mole of Y and each square a mole of X, how many moles of X did one start with? How many moles of Y? (c) Using the same representation described in part (b), how many moles of product are formed? How many moles of X and Y are left unreacted?
itamin B12 , cyancobalamin, is essential for human nutrition. Its molecular formula is C63H88CoN14O14P . A lack of this vita min in the diet can lead to anemia. Cyanocohalamin is the form of the vitamin found in vitamin supplements. l type='a'> What is the molar mass of cyanocobalamin to two decimal places? How many moles of cyanocohalamin molecules are present in 250 mg of cyanocobalamin? What is the mass of 0.60 mole of cyanocobalamin? How many atoms of hydrogen are in 1 .0 mole of cyanocobalamin? What is the mass of 1.0107 molecules of cyanocobalamin? What is the mass (in grams) of one molecule of cyanocobalamin?
Consider the following mixture of SO2(g) and O2(g). If SO2(g) and O2(g) react to form SO3(g), draw a representation of the product mixture assuming the reaction goes to completion. What is the limiting reactant in the reaction? If 96.0 g of SO2 react with 32.0 g O2, what mass o f product will form?
Sodium borate decahydrate, Na2B4O710H2O is commonly known as borax. It is used as a deodorizer and mold inhibitor. A sample weighing 15.86 g is heated until a constant mass is obtained indicating that all the water has been evaporated off. (a) What percent, by mass of Na2B4O710H2O is water? (b) What is the mass of the anhydrous sodium borate, Na2B4O7?
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3.79 Consider two samples. Sample A contains 2 moles of N2 and 1 mole of O2, and Sample B contains 1 mole of N2O5. (a) Which sample contains more molecules? (b) Which sample contains more oxygen atoms? (c) Which sample contains more nitrogen atoms?
Using the average atomic masses given inside the front cover of the text, calculate the mass in grams of each of the following samples. l type='a'> 5.0 moles of nitric acid 0.000305 mole of mercury 2.31105mole of potassium chromate 10.5 moles of’ aluminum chloride 4.9104moles of sulfur hexafluoride 1 25 moles of ammonia 0.01205 mole of sodium peroxide
Write the balanced chemical equation for the complete combustion of adipic acid, an organic acid containing 49.31% C, 6.90% H, and the remainder O, by mass.
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When 9.59 g of a certain vanadium oxide is heated in the presence of hydrogen, and a new oxide of vanadium are formed. This new vanadium oxide has a mass of 8.76 g. When the second vanadium oxide undergoes additional heating in the presence Of hydrogen, 5.38 g of vanadium metal forms, a. Determine the empirical formulas for the two vanadium oxides. b. Write balanced equations for the Steps of the reaction. c. Determine the mass of hydrogen needed to complete the steps of this reaction.
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