OWLv2 for Bettelheim/Brown/Campbell/Farrell/Torres' Introduction to General, Organic and Biochemistry, 11th Edition, [Instant Access], 1 term (6 months)
11th Edition
ISBN: 9781305106734
Author: Frederick A. Bettelheim; William H. Brown; Mary K. Campbell; Shawn O. Farrell; Omar Torres
Publisher: Cengage Learning US
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Textbook Question
Chapter 4.6, Problem 4.9P
Problem 4-9 How many moles of C atoms, H atoms, and O atoms are in 2.5 mol of glucose, C6H12O6?
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#30 problem B
Practice Problem ATTEMPT Diethyl ether is produced from ethanol according to the following equation:
2CH;CH,OH(1)
CH;CH,OCH,CH;(1) + H,O(1)
Calculate the percent yield if 68.6 g of ethanol reacts to produce 16.1 g of ether.
PROBLEM-SOLVING EXAMPLE 3-6 Percent Composition
of Hydrated Salt
Epsom salt is MgSO4 7 H,O. (a) What is the percent by mass of water in Epsom salt?
(b) What are the percentages of each element in Epsom salt?
Strategy and Explanation
a. We first find the molar mass of Epsom salt, which is the sum of the molar masses of
the atoms in the chemical formula:
[1 mol Mg x (24.31 g Mg/mol Mg)] + [1 mol S × (32.07 g S/mol S)]
+ [4 mol O x (15.9994 g O/mol O)] + [14 mol H x (1.0079 g H/mol H)]
+ [7 mol O x (15.9994 g O/mol O)] = 246.49 g/mol Epsom salt
%3D
Because 1 mol Epsom salt contains 7 mol H,O, the mass of water in 1 mol Epsom salt is,
7 mol H,O x (18.012 g H,O/mol H,O) = 126.08 g H,0
126.08 g water per mol Epsom salt
% H,O
x 100% = 51.15% H,0
246.49 g/mol Epsom salt
D. We calculate the percentage of magnesium from the ratio of the mass of magnesium
in 1 mol Epsom salt to the mass of Epsom salt in 1 mol:
% Mg
mass of Mg in 1 mol Epsom salt
mass of Epsom salt in 1 mol
24.31 g Mg
246.49 g/mol…
Chapter 4 Solutions
OWLv2 for Bettelheim/Brown/Campbell/Farrell/Torres' Introduction to General, Organic and Biochemistry, 11th Edition, [Instant Access], 1 term (6 months)
Ch. 4.2 - Problem 4-1 Following is an unbalanced equation...Ch. 4.2 - Problem 4-2 Balance this equation:Ch. 4.2 - Prob. 4.3PCh. 4.3 - Problem 4-4 When a solution of copper(II)...Ch. 4.4 - Problem 4-5 In each equation, identify the...Ch. 4.5 - Problem 4-6 What is (a) the molecular weight of...Ch. 4.6 - Prob. 4.7PCh. 4.6 - Problem 4-8 We wish to weigh 2.84 mol of sodium...Ch. 4.6 - Problem 4-9 How many moles of C atoms, H atoms,...Ch. 4.6 - Problem 4-10 How many moles of copper(I) ions,...
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