Concept explainers
Interpretation: The sample with the greatest percent by mass of nitrogen needs to be determined.
Concept Introduction: Mass percentage is the way to calculate the percentage of each element in the given molecular compounds. The mathematical expression of mass percentage can be shown as:
Answer to Problem 69A
Correct answer: (d)
Mass percentage of N = 39.0 %
Explanation of Solution
Reason for correct option:
Molar mass of
Substitute the values to calculate mass percentage of N:
All the samples have same molecular formula therefore the mass percentage of N will be same.
Reasons for incorrect options:
The mass percentage of an element in a chemical compound remains same with change in moles as it depends on chemical formula.
Chapter 6 Solutions
World of Chemistry, 3rd edition
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