
Concept explainers
(a)
Interpretation:
The formula and molecular mass of sodium dichromate are to be determined.
Concept introduction:
The molecular formula of a compound is a representation which suggests the total number of atoms of each element the compound is made of.
The molecular mass of a compound is defined as the sum of the atomic masses of all the atoms present in it.
The general formula to calculate the molecular mass of a compound is,
(a)

Answer to Problem 2.103P
The molecular formula for sodium dichromate is
Explanation of Solution
Dichromate is a polyatomic ion. The formula for the dichromate ion is
Hence the molecular formula for sodium dichromate becomes
The formula to calculate the molecular mass of
Substitute
The molecular formula for sodium dichromate is
(b)
Interpretation:
The formula and molecular mass of ammonium perchlorate are to be determined
Concept introduction:
The molecular formula of a compound is a representation which suggests the total number of atoms of each element the compound is made of.
The molecular mass of a compound is defined as the sum of the atomic masses of all the atoms present in it.
The general formula to calculate the molecular mass of a compound is,
(b)

Answer to Problem 2.103P
The molecular formula for ammonium perchlorate is
Explanation of Solution
Ammonium and perchlorate are polyatomic ions. The formula for the perchlorate ion is
Hence the molecular formula for ammonium perchlorate phosphate becomes
The formula to calculate the molecular mass of
Substitute
The molecular formula for ammonium perchlorate is
(c)
Interpretation:
The formula and molecular mass of magnesium nitrite trihydrate are to be determined
Concept introduction:
The molecular formula of a compound is a representation which suggests the total number of atoms of each element the compound is made of.
The molecular mass of a compound is defined as the sum of the atomic masses of all the atoms present in it.
The general formula to calculate the molecular mass of a compound is,
(c)

Answer to Problem 2.103P
The molecular formula for magnesium nitrite trihydrate is
Explanation of Solution
Nitrite is a polyatomic ion. The formula for the carbonate ion is
Magnesium belongs to the
While naming compounds containing polyatomic ions, when two or more of the same polyatomic ion are present, the ion appears in parentheses. The total number of the polyatomic ion is written as a subscript outside the parentheses.
In magnesium nitrite, two nitrite polyatomic ions associate with one magnesium ion. Hence the molecular formula becomes
Magnesium nitrite trihydrate is the hydrated form of the ionic compound magnesium nitrite. Upon hydration, the molecule of magnesium nitrite bonds with three molecules of water to form a trihydrate molecule. In the molecular formula, the water molecules are shown after a centred dot. Hence the formula for magnesium nitrite trihydrate becomes
The formula to calculate the molecular mass of
Substitute
The molecular formula for magnesium nitrite trihydrate is
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Chapter 2 Solutions
Loose Leaf for Chemistry: The Molecular Nature of Matter and Change
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