General Chemistry
General Chemistry
4th Edition
ISBN: 9781891389603
Author: Donald A. McQuarrie, Peter A. Rock, Ethan B. Gallogly
Publisher: University Science Books
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Chapter 2, Problem 2.30P

(a)

Interpretation Introduction

Interpretation:

Molecular mass of C20H30O has to be calculated to five significant figures.

Concept Introduction:

In a molecule, the sum of atomic mass of all the atoms is known as molecular mass.  Atomic mass of an atom is the average of all the isotope of the particular element.  Molecular mass can be used to calculate the mass percentage of the atom present in the molecule.

(a)

Expert Solution
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Explanation of Solution

Given vitamin is C20H30O.  Atomic mass of C is 12.0107g/mol.  Atomic mass of H is 1.008g/mol.  Atomic mass of oxygen is 15.9994g/mol.  Molecular mass of C20H30O is calculated as shown below.

MolecularmassofC20H30O=20(atomicmassofC)+30(atomicmassofH)+1(atomicmassofO)=20(12.0107g/mol) + 30(1.008g/mol) + 1(15.9994g/mol)=240.214g/mol + 30.24g/mol + 15.9994g/mol=286.45g/mol

Therefore, molecular mass of C20H30O is 286.45 g/mol.

(b)

Interpretation Introduction

Interpretation:

Molecular mass of C12H17ClN4O6 has to be calculated to five significant figures.

Concept Introduction:

Refer part (a).

(b)

Expert Solution
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Explanation of Solution

Given vitamin is C12H17ClN4OS.  Atomic mass of C is 12.0107g/mol.  Atomic mass of H is 1.008g/mol.  Atomic mass of oxygen is 15.9994g/mol.  Atomic mass of chlorine is 35.453g/mol.  Atomic mass of nitrogen is 14.0067g/mol.  Atomic mass of sulfur is 32.065g/mol.  Molecular mass of C12H17ClN4OS is calculated as shown below.

MolecularmassofC12H17ClN4OS=12(atomicmassofC)+17(atomicmassofH)   +1(atomicmassofCl)+4(atomicmassofN)+1(atomicmassofO)+1(atomicmassofS)=12(12.0107g/mol) + 17(1.008g/mol)      + 1(35.453g/mol)+ 4(14.0067g/mol)       + 1(15.9994g/mol)+ 1(32.065g/mol)=144.1284g/mol + 17.136g/mol + 35.453g/mol     + 56.0268g/mol + 15.9994g/mol + 32.065g/mol=300.81 g/mol

Therefore, molecular mass of C12H17ClN4OS is 300.81 g/mol.

(c)

Interpretation Introduction

Interpretation:

Molecular mass of C17H20N4O6 has to be calculated to five significant figures.

Concept Introduction:

Refer part (a).

(c)

Expert Solution
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Explanation of Solution

Given vitamin is C17H20N4O6.  Atomic mass of C is 12.0107g/mol.  Atomic mass of H is 1.008g/mol.  Atomic mass of oxygen is 15.9994g/mol.  Atomic mass of nitrogen is 14.0067g/mol.  Molecular mass of C12H17ClN4OS is calculated as shown below.

MolecularmassofC17H20N4O6=17(atomicmassofC)+20(atomicmassofH)   +4(atomicmassofN)+6(atomicmassofO)=17(12.0107g/mol) + 20(1.008g/mol)      + 4(14.0067g/mol) + 6(15.9994g/mol)=204.1819g/mol + 20.16g/mol + 56.0268g/mol      + 95.9964g/mol=376.37 g/mol

Therefore, molecular mass of C17H20N4O6 is 376.37 g/mol.

(d)

Interpretation Introduction

Interpretation:

Molecular mass of C56H88O2 has to be calculated to five significant figures.

Concept Introduction:

Refer part (a).

(d)

Expert Solution
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Explanation of Solution

Given vitamin is C56H88O2.  Atomic mass of C is 12.0107g/mol.  Atomic mass of H is 1.008g/mol.  Atomic mass of oxygen is 15.9994g/mol.  Molecular mass of C56H88O2 is calculated as shown below.

MolecularmassofC56H88O2=56(atomicmassofC)+88(atomicmassofH)       +2(atomicmassofO)=56(12.0107g/mol) + 88(1.008g/mol) + 2(15.9994g/mol)=672.5992g/mol + 88.704g/mol + 31.9988g/mol=793.30g/mol

Therefore, molecular mass of C56H88O2 is 793.30 g/mol.

(e)

Interpretation Introduction

Interpretation:

Molecular mass of C6H8O6 has to be calculated to five significant figures.

Concept Introduction:

Refer part (a).

(e)

Expert Solution
Check Mark

Explanation of Solution

Given vitamin is C6H8O6.  Atomic mass of C is 12.0107g/mol.  Atomic mass of H is 1.008g/mol.  Atomic mass of oxygen is 15.9994g/mol.  Molecular mass of C6H8O6 is calculated as shown below.

MolecularmassofC6H8O6=6(atomicmassofC)+8(atomicmassofH)       +6(atomicmassofO)=6(12.0107g/mol) + 8(1.008g/mol) + 6(15.9994g/mol)=72.0642g/mol + 8.064g/mol + 95.9964g/mol=176.12g/mol

Therefore, molecular mass of C6H8O6 is 176.12 g/mol.

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