(a)
The percentage by mass of each element in lime,
CaCO 3
.
(a)
Answer to Problem 8E
Explanation of Solution
The percentage by mass of an element in a compound is defined as the percentage of the total mass of that element present in the total mass or formula mass of the compound. Mass percent of any element B in compound AB is given as,
Atomic mass of carbon
Atomic mass of oxygen
The chemical formula of lime is
The total mass of oxygen
Substitute
The formula mass of lime,
Substitute
The percentage by mass of calcium
Substitute
The percentage by mass of carbon
Substitute
The percentage by mass of oxygen
Substitute
Conclusion:
Therefore, the percentage by mass of calcium
(b)
The percentage by mass of each element in milk of magnesium,
Mg ( OH ) 2
.
(b)
Answer to Problem 8E
Explanation of Solution
The percentage by mass of an element in a compound is defined as the percentage of total mass of that element present in the total mass or formula mass of the compound. Mass percent of any element B in compound AB is given as,
Atomic mass of magnesium
Atomic mass of oxygen
Atomic mass of hydrogen
The chemical formula of milk of magnesium is
The total mass of oxygen
Substitute
The total mass of hydrogen
Substitute
The formula mass of milk of magnesium,
Substitute
The percentage by mass of magnesium
Substitute
The percentage by mass of oxygen
Substitute
The percentage by mass of hydrogen
Substitute
Conclusion:
Therefore, the percentage by mass of magnesium
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Chapter 12 Solutions
An Introduction to Physical Science
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