Concept explainers
Each quarter produced by the U.S. mint is made up of a copper and nickel alloy. In each coin, there is 0.00740 mole of Ni and 0.0886 mole of copper. (a) What is the total mass of a quarter? (b) What percentage of the mass of a quarter is nickel and what percentage is copper?
(a)
The total mass of the quarter.
Answer to Problem 30AAP
The total mass of the quarter is
Explanation of Solution
Write the expression to calculate mass of nickel
Here, number of moles of nickel is
Write the expression to calculate mass of copper
Here, number of moles of copper is
Write the expression to calculate total mass of the quarter
Conclusion:
The molar masses of copper and nickel are
Substitute
Substitute
Substitute
Thus, the total mass of the quarter is
(b)
The percentages of mass of nickel and mass of copper in the quarter.
Answer to Problem 30AAP
The percentages of mass of nickel and mass of copper in the quarter are
Explanation of Solution
Write the expression to calculate percentage of mass of nickel
Write the expression to calculate percentage of mass of copper
Conclusion:
Substitute
Substitute
Thus, the percentages of mass of nickel and mass of copper in the quarter are
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Chapter 2 Solutions
Foundations of Materials Science and Engineering
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