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When aluminum metal is heated with an element from Group 6A of the periodic table, an ionic compound forms. When the experiment is performed with an unknown Group 6A element, the product is 18.56% AI by mass. What is the formula of the compound?
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Chemistry: An Atoms First Approach
2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
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Chapter
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BuyFindarrow_forward
Chemistry: An Atoms First Approach
2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 5, Problem 175CP
Textbook Problem
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When aluminum metal is heated with an element from Group 6A of the periodic table, an ionic compound forms. When the experiment is performed with an unknown Group 6A element, the product is 18.56% AI by mass. What is the formula of the compound?
Interpretation Introduction
Interpretation: The mass percent of aluminum
Concept introduction: The ionic compound is formed by the complete transfer of electrons between atoms.
The oxidation state of 6A element is
The number of moles is the ratio of mass of compound to its molar mass.
To determine: The formula of ionic compound that is formed due to reaction of aluminum with group 6A elements.
Explanation of Solution
Given
The mass percent of aluminum
When aluminum metal is heated with an element from group 6A elements, an ionic compound is formed having the chemical formula,
Where,
- X is group 6A element.
The ratio of aluminum and element XÂ in
If the mass of ionic compound is taken
It is assumed that atomic mass of element XÂ is A.
The atomic mass of aluminum is
Formula
The number of moles is calculated by using the formula,
Substitute the values of mass and atomic mass of aluminum in equation (2).
Chapter 5 Solutions
Chemistry: An Atoms First Approach
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