Concept explainers
(a)
Interpretation:
The percent by mass of the element whose symbol occurs first in the following compound’s formula should be calculated.
Concept Introduction:
Percent by mass of an element can be calculated by the following equation.
Answer to Problem 16CR
Percentage of C per mole of C6 H6 ( l ) by mass =
Explanation of Solution
Molar mass of C6 H6 ( l ) =
Mass of C present per mole of C6 H6 =
Percentage of C per mole of C6 H6 ( l ) by mass =
=
(b)
Interpretation:
The percent by mass of the element whose symbol occurs first in the following compound’s formula should be calculated.
Concept Introduction:
Percent by mass of an element can be calculated by the following equation.
Answer to Problem 16CR
Percentage of Na per mole of Na2 SO4 by mass =
Explanation of Solution
Molar mass of Na2 SO4 ( s ) =
Mass of Na present per mole of Na2 SO4 =
Percentage of Na per mole of Na2 SO4 by mass =
=
(c)
Interpretation:
The percent by mass of the element whose symbol occurs first in the following compound’s formula should be calculated.
Concept Introduction:
Percent by mass of an element can be calculated by the following equation.
Answer to Problem 16CR
Percentage of C per mole of CS2 ( l ) by mass =
Explanation of Solution
Molar mass of CS2 ( l ) =
Mass of C present per mole of CS2 ( l ) =
Percentage of C per mole of CS2 ( l ) by mass =
=
(d)
Interpretation:
The percent by mass of the element whose symbol occurs first in the following compound’s formula should be calculated.
Concept Introduction:
Percent by mass of an element can be calculated by the following equation.
Answer to Problem 16CR
Percentage of Al per mole of AlCl3 ( s ) by mass =
Explanation of Solution
Molar mass of AlCl3 ( s ) =
Mass of Al present per mole of AlCl3 ( s ) =
Percentage of Al per mole of AlCl3 ( s ) by mass =
=
(e)
Interpretation:
The percent by mass of the element whose symbol occurs first in the following compound’s formula should be calculated.
Concept Introduction:
Percent by mass of an element can be calculated by the following equation.
Answer to Problem 16CR
Percentage of Cu per mole of Cu2 O( s ) by mass =
Explanation of Solution
Molar mass of Cu2 O( s ) =
Mass of Cu present per mole of Cu2 O( s ) =
Percentage of Cu per mole of Cu2 O( s ) by mass =
=
(f)
Interpretation:
The percent by mass of the element whose symbol occurs first in the following compound’s formula should be calculated.
Concept Introduction:
Percent by mass of an element can be calculated by the following equation.
Answer to Problem 16CR
Percentage of Cu per mole of CuO( s ) by mass =
Explanation of Solution
Molar mass of CuO( s ) =
Mass of Cu present per mole of CuO( s ) =
Percentage of Cu per mole of CuO( s ) by mass =
=
(g)
Interpretation:
The percent by mass of the element whose symbol occurs first in the following compound’s formula should be calculated.
Concept Introduction:
Percent by mass of a element can be calculated by the following equation.
Answer to Problem 16CR
Percentage of Co per mole of Co2 O3 ( s ) by mass =
Explanation of Solution
Molar mass of Co2 O3 ( s ) =
Mass of Co present per mole of Co2 O3 ( s ) =
Percentage of Co per mole of Co2 O3 ( s ) by mass =
=
(h)
Interpretation:
The percent by mass of the element whose symbol occurs first in the following compound’s formula should be calculated.
Concept Introduction:
Percent by mass of a element can be calculated by the following equation.
Answer to Problem 16CR
Percentage of C per mole of C6 H1 2 O6 ( s ) by mass =
Explanation of Solution
Molar mass of C6 H1 2 O6 ( s ) =
Mass of C present per mole of C6 H1 2 O6 ( s ) =
Percentage of C per mole of C6 H1 2 O6 ( s ) by mass =
=
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Chapter 9 Solutions
EBK INTRODUCTORY CHEMISTRY
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