Concept explainers
(a)
Interpretation:
The percentage of the mass of the element listed first in the formula of methane, CH4 needs to be determined.
Concept Introduction:
The percentage by mass of any component in a compound is calculated as follows:
(a)
Answer to Problem 28A
74.83 %
Explanation of Solution
Mass of C = 12.011 g Molar mass of CH4 =16.05g/mol
Thus,
(b)
Interpretation:
The percentage of the mass of the element listed first in the formula of the given compound NaNO3 needs to be determined.
Concept Introduction:
The percentage by mass of any component in a compound is calculated as follows:
(b)
Answer to Problem 28A
27.06 %
Explanation of Solution
Mass of Na= 22.99 g
The molar mass of the given compound = 84.97 g/mol
(c)
Interpretation:
The percentage of the mass of the element listed first in the formula of the given compound carbon monoxide CO needs to be determined.
Concept Introduction:
(c)
Answer to Problem 28A
42.89 %
Explanation of Solution
Mass of C = 12.011 g
Molar mass of given compound = 28.0 g/mol
Thus,
(d)
Interpretation:
The percentage of the mass of the element listed first in the formula of the given compound NO2 needs to be determined.
Concept Introduction:
(d)
Answer to Problem 28A
30.46 %
Explanation of Solution
Mass of N = 14.01 g
The molar mass of given compound = 45.99 g/mol
(e)
Interpretation:
The percentage of the mass of the element listed first in the formula of the given compound1-octanol, C8H18O needs to be determined.
Concept Introduction:
(e)
Answer to Problem 28A
73.77 %
Explanation of Solution
Mass of C = 12.011 g
Molar mass of given compound = 130.25 g/mol
(f)
Interpretation:
The percentage of the mass of the element listed first in the formula of the given compound calcium phosphate, Ca3(PO4)2 needs to be determined.
ConceptIntroduction:
(f)
Answer to Problem 28A
38.77 %
Explanation of Solution
Mass of Ca = 40.08 g
Molar mass of given compound = 310.1g/mol
(g)
Interpretation:
The percentage of the mass of the element listed first in the formula of the given compound 3-phenylphenol, C12H10O needs to be determined.
Concept Introduction:
(g)
Answer to Problem 28A
84.67 %
Explanation of Solution
Mass of C = 12.011 g
The molar mass of given compound = 170.21 g/mol
(h)
Interpretation:
The percentage of the mass of the element listed first in the formula of the given compound aluminum acetate, Al(C2H3O2)3 needs to be determined.
Concept Introduction:
(h)
Answer to Problem 28A
13.22 %
Explanation of Solution
Mass of Al = 26.98 g
The molar mass of given compound = 204.07 g/mol
Chapter 6 Solutions
World of Chemistry
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