Chemistry: Principles and Practice
3rd Edition
ISBN: 9780534420123
Author: Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher: Cengage Learning
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Chapter 3, Problem 3.78QE
(a)
Interpretation Introduction
Interpretation:
The percentage by mass of each element in C6H12 has to be calculated.
(a)
Expert Solution
Explanation of Solution
First the molar mass of C6H12 has to be calculated.
6(C) 6×12.01u=72.06u12(H)12×1.01u=12.12u--------------------------Molecular mass C6H12 = 84.18u.
Thus one mole of C6H12 has a mass of 84.18 g that comes from 72.06g carbon, and 12.12g hydrogen. These values are used to express the mass composition of the compound as percentages.
%C: 72.06gC84.18g C6H12×100%=85.6%C%H: 12.12 gH84.18g C6H12×100% = 14.4%H
(b)
Interpretation Introduction
Interpretation:
The percentage by mass of each element in C5H12O has to be calculated.
(b)
Expert Solution
Explanation of Solution
First the molar mass of C5H12O has to be calculated.
5(C) 5×12.01u=60.05u12(H) 12×1.01u=12.12u1(O) 1 × 15.999u = 15.999 u--------------------------Molecular mass C5H12O = 88.169u.
Thus one mole of C5H12O has a mass of 88.169 g that comes from 60.05g carbon, 12.12g hydrogen and 15.999 g oxygen. These values are used to express the mass composition of the compound as percentages.
%C: 60.05gC88.169g C5H12O×100%=68.11%C%H: 12.12 gH88.169g C5H12O×100% = 13.75%H%O: 15.999 gO88.169g C5H12O×100% = 18.15%O
(c)
Interpretation Introduction
Interpretation:
The percentage by mass of each element in NiCl2 has to be calculated.
(c)
Expert Solution
Explanation of Solution
First the molar mass of NiCl2 has to be calculated.
1(Ni) 1×58.69u=58.69u2(Cl) 2×35.45u=70.9u--------------------------Molecular mass NiCl2 = 129.59u.
Thus one mole of NiCl2 has a mass of 129.59 g that comes from 58.69g nickel and 70.9 g chlorine. These values are used to express the mass composition of the compound as percentages.
%Ni: 58.69gNi129.59g NiCl2×100%=45.29%Ni%Cl: 70.9 gCl129.59g NiCl2×100% = 54.71%Cl
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Chapter 3 Solutions
Chemistry: Principles and Practice
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