Concept explainers
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l type='a'>
(a)
Interpretation:
The molar mass of cyanocobalamin upto two decimal places is to be calculated.
Concept Introduction:
A molar mass of a substance is the mass of the substance divided by the number of moles of the substance. The SI unit of molar mass of
The formula to calculate the molar mass is,
Answer to Problem 128CP
The molar mass of cyanocobalamin to two decimal places is
Explanation of Solution
The molecular formula of cyanocobalamnin is
The molar mass of carbon is
The molar mass of hydrogen is
The molar mass of oxygen is
The molar mass of nitrogen is
The molar mass of phosphorus is
The molar mass of cobalt is
The molar mass of cyanocobalamnin is calculated by the expression,
Substitute the respective values of molar mass of each element in the above exopression.
Thus, the molar mass of cyanocobalmaine is
(b)
Interpretation:
The number of moles of cyanaocobalamin molecules present in
Concept Introduction:
A mole of a substance contains exactly
The formula to calculate the number of moles is:
Answer to Problem 128CP
The number of moles of cyanocobalamin molecules present in
Explanation of Solution
The given mass of cyanocobalamin is
The conversion of
Thus, the mass of cyanocobalamin is
The molar mass of cyanocobalamin is
The moles of cyanocobalamin is calculated by the expression,
Substitute the value of mass and molar of cyanocobalamin in the above expression.
The number of moles of cyanocobalamin molecules present in
(c)
Interpretation:
The mass of
Concept Introduction:
A mole of a substance contains exactly
The formula to calculate the number of moles is:
Answer to Problem 128CP
The mass of
Explanation of Solution
The given moles of cyanocobalamin is
The molar mass of cyanocobalamin is
The mass of cyanocobalamin is calculated by the expression,
Substitute the value of moles and molar of cyanocobalamin in the above expression.
Thus, the mass of
(d)
Interpretation:
The atoms of hydrogen that are present in
Concept Introduction:
A mole of a substance contains exactly
The formula to calculate the number of moles is:
Answer to Problem 128CP
The atoms of hydrogen that are present in
Explanation of Solution
The given moles of cyanocobalamin is
According to the molecular formula of cyanocobalamine that is
If
Thus, atoms of hydrogen that are present in
(e)
Interpretation:
The mass of
Concept Introduction:
A mole of a substance contains exactly
The formula to calculate the number of moles is:
Answer to Problem 128CP
The mass of
Explanation of Solution
The given number of molecules of cyanocobalamin is
The molar mass of cyanocobalamin is
Thus, the mass of
Thus, the mass of
(f)
Interpretation:
The mass of one molecule of cyanocobalamine is to be stated.
Concept Introduction:
A mole of a substance contains exactly
The formula to calculate the number of moles is:
Answer to Problem 128CP
The mass of one molecule of cyanocobalamine is
Explanation of Solution
The given number of molecules of cyanocobalamin is
The molar mass of cyanocobalamin is
Thus, the mass of
Thus, the mass of
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Chapter 8 Solutions
Introductory Chemistry: A Foundation 8th Edition Access Code
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