
Interpretation:
The given inter halogen compounds have to be arranged in increasing order of percentage of fluorine by mass.
Concept introduction:
Percent composition by mass of each element present in a compound is known as the compound’s percent composition by mass.
Percent by mass of an element = n ×atomic mass of elementmolecular or formula mass of compound×100%Where n is the number of atoms of the element in a molecule or formula unit of the compound

Answer to Problem 5.78QP
The percentage of fluorine by mass of given inter halogen compounds was arranged in the increasing order as,
IF5<BrF5<ClF3<ClF5
IF5 contains the smallest percentage of fluorine by mass.
Explanation of Solution
Percent composition by mass: Percent composition by mass of each element present in a compound is known as the compound’s percent composition by mass. The formula is expressed mathematically as follows:
Percent by mass of an element = n ×atomic mass of elementmolecular or formula mass of compound×100%Where n is the number of atoms of the element in a molecule or formula unit of the compound By using the above formula, percentage fluorine by mass of interhalogen compounds is calculated as follows:
Percent by mass of % F in ClF3 = 3×atomic mass F in amumolecular mass of ClF3 in amu× 100% = 3×18.9984 amu92.448 amu× 100% = 61.62 %
Percent by mass of % F in BrF5 = 5×atomic mass F in amumolecular mass of BrF5 in amu× 100% = 5×18.9984 amu174.894 amu× 100% =54.31%
Percent by mass of % F in IF5 = 5×atomic mass F in amumolecular mass of IF5 in amu× 100% = 5×18.9984 amu221.89 amu× 100% = 42.79%
Percent by mass of % F in ClF5 = 3×atomic mass F in amumolecular mass of ClF5 in amu× 100% = 5×18.9984 amu130.445 amu× 100% = 72.82%
The percentage fluorine by mass of interhalogen compounds was arranged in the below order:
IF5<BrF5<ClF3<ClF5
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Chapter 5 Solutions
Chemistry Atoms First, Second Edition
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