Fundamentals of General, Organic, and Biological Chemistry (8th Edition)
Fundamentals of General, Organic, and Biological Chemistry (8th Edition)
8th Edition
ISBN: 9780134015187
Author: John E. McMurry, David S. Ballantine, Carl A. Hoeger, Virginia E. Peterson
Publisher: PEARSON
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Textbook Question
Chapter 6, Problem 6.15UKC

Methionine, an amino acid used by organisms to make proteins, can be represented by the following ball-and-stick molecular model. Write the formula for methionine, and give its molecular weight (red = O, black = C, blue = N, yellow = S, white = H).

Chapter 6, Problem 6.15UKC, Methionine, an amino acid used by organisms to make proteins, can be represented by the following

Expert Solution & Answer
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Interpretation Introduction

Interpretation:

The formula and molecular weight for methionine and should be determined by using the given ball- and- stick molecular model.

Concept Introduction:

Molecular Formula: It is the simplest representation of composition of chemical substance where each and every type of atom is written with the total number of the atom present in the substance.

Molecular weight: The sum of mass of all atoms present in formula of chemical substance is referred as molecular or formula weight of that substance.

Answer to Problem 6.15UKC

The empirical formula for the given structure is C5H11NO2S.

The molecular weight of (C5H11NO2S) is 149 amu.

Explanation of Solution

Comparing the given details such as red color indicates O, black is C, blue is N yellow is S and white is H with the given molecular model it is clear that there are 5C,11H,1N,2Oand1S. Hence the empirical formula for the given structure is C5H11NO2S.

The molecular weight for C5H11NO2S is calculated as follows,

C =12.0amu5C=60amu(12.0 ×5)

MW ofH =111H =11amu(1×11)MW ofN =141N =14amu(1×14)MW ofO =162O =32amu(2×16)MW ofS =321S =32amu(1×32 )

Finally, molecular weight is obtained by adding 60+11+14+32+32 which is equal to 149 amu

Conclusion

The molecular formula for methionine and molecular weight is determined by using the given ball- and- stick molecular model with details.

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Chapter 6 Solutions

Fundamentals of General, Organic, and Biological Chemistry (8th Edition)

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