Concept explainers
(a)
Interpretation:
The formula mass of methionine has to be calculated.
Concept Introduction:
Formula mass:
Formula mass of a compound is the sum of the
(a)

Explanation of Solution
Given:
Protein present in our bodies consists of amino acids. One such amino acid is methionine and its molecular formula is
Calculation of formula mass:
The formula mass of
Therefore, the formula mass of methionine is
The formula mass and molar mass are related. The formula mass of a compound in
(b)
Interpretation:
The number of oxygen atoms present in one mole of methionine compound has to be calculated.
(b)

Explanation of Solution
Given:
Protein present in our bodies consists of amino acids. One such amino acid is methionine and its molecular formula is
The given mole of methionine is one mole.
Calculation of
The number of oxygen atoms present in
That is, one mole of methionine contains two moles of oxygen atoms.
One mole of an atom contains
The number of atoms present in one mole of methionine is calculated as follows,
Therefore, the number of oxygen atoms present in given moles of methionine is
(c)
Interpretation:
The amount of oxygen present in one mole of methionine compound has to be calculated.
Concept Introduction:
Mass:
Mass of the compound is calculated by mole of the compound multiplied with molar mass of the compound.
(c)

Explanation of Solution
Given:
Protein present in our bodies consists of amino acids. One such amino acid is methionine and its molecular formula is
The given mole of methionine is one mole.
Calculation of number of atoms:
The number of oxygen atoms present in
That is, one mole of methionine contains two moles of oxygen atoms.
The molar mass of oxygen is
The mass of oxygen present in one mole of methionine is calculated as follows,
Therefore, the mass of oxygen atom present in the given moles of methionine is
(d)
Interpretation:
The amount of oxygen present in
Concept Introduction:
Moles:
Mole of the substance is found by dividing the mass of the substance by its molar mass.
(d)

Explanation of Solution
Given:
Protein present in our bodies consists of amino acids. One such amino acid is methionine and its molecular formula is
The given mass of methionine is
Calculation of number of atoms:
The molar mass of methionine is
Determine the moles of methionine present in given amount of methionine as follows,
The number of methionine present is
The number of oxygen atoms present in methionine is 2
That is, one mole of methionine contains two moles of oxygen atoms.
The moles of oxygen present in given moles of methionine is found as,
Thus, the moles of oxygen present is
The molar mass of oxygen is
The mass of oxygen present in given methionine is calculated as follows,
Therefore, the mass of oxygen atom present in the given amount of methionine is
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Chapter 4 Solutions
GENERAL,ORGANIC+BIOCHEM (LOOSELEAF)
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