
Concept explainers
(a)
Interpretation:
The mass in grams for
Concept introduction:
One mole of atoms, molecules or particles is defined as a quantity whose mass is equivalent to its gram

Answer to Problem 18E
The mass of
Explanation of Solution
First the number of moles of krypton is calculated by the formula shown below.
The atoms of krypton is
Substitute the value of given atoms of krypton and the value of Avogadro’s number in equation (1) to calculate the number of moles of krypton.
The mass in grams for
The molar mass of krypton is
Substitute the value of moles and molar mass of krypton in equation (2) to calculate the mass.
Therefore, the mass of
The mass of
(b)
Interpretation:
The mass in grams for
Concept introduction:
One mole of atoms, molecules or particles is defined as a quantity whose mass is equivalent to its gram atomic mass or molecular mass. One mole of any substance possesses fixed Avogadro’s number, which is equivalent to

Answer to Problem 18E
The mass of
Explanation of Solution
The mass of
The molar mass of
Substitute the values of number of molecules of
Therefore, the mass of
The mass of
(c)
Interpretation:
The mass in grams for
Concept introduction:
One mole of atoms, molecules or particles is defined as a quantity whose mass is equivalent to its gram atomic mass or molecular mass. One mole of any substance possesses fixed Avogadro’s number, which is equivalent to

Answer to Problem 18E
The mass of
Explanation of Solution
The moles of magnesium perchlorate,
The formula unit of magnesium perchlorate is
Substitute the value of the formula unit of magnesium perchlorate and the value of Avogadro’s number in equation (4) to calculate the moles of magnesium perchlorate.
The mass in grams for
The molar mass of
Substitute the value of moles of
Therefore, the mass of
The mass of
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Chapter 8 Solutions
Introductory Chemistry: Concepts and Critical Thinking (8th Edition)
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