Equilibrium Vacancies Calculation for a Hypothetical Metal at 900°C
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Questions and Answers

What is the first step to compute the composition, in atom percent, of the alloy?

  • Use Equation 5.8a
  • Calculate the number of moles of copper and zinc (correct)
  • Determine the atomic weights of copper and zinc
  • Substitute into Equation S5.22a

    • What is the atomic weight of copper?

  • 65.41 g/mol
  • 47 g
  • 63.55 g/mol (correct)
  • 33 g

    • What is the number of moles of zinc in the alloy?

  • 65.41 g/mol
  • 47 g
  • 0.519 mol
  • 0.719 mol (correct)

    • What is the equilibrium number of vacancies for the hypothetical metal at 900° C?

    <p>2.3 × 10^25 m−3</p> Signup and view all the answers

    What is the composition of copper in atom percent (at%) in the alloy?

    <p>41.9 at%</p> Signup and view all the answers

    How is the fraction of vacancies calculated for the hypothetical metal at 900° C?

    <p>Ratio of equilibrium vacancies to total lattice sites</p> Signup and view all the answers

    Which equation should be used to compute the composition in atom percent of an alloy?

    <p>Equation 5.8a</p> Signup and view all the answers

    What is used to calculate the total number of lattice sites in the hypothetical metal?

    <p>Equation 5.2</p> Signup and view all the answers

    What is the final step after calculating the atomic percent of copper and zinc in the alloy?

    <p>Combine both atomic percents to get final composition</p> Signup and view all the answers

    Which equation was asked to be derived in Solution 7.2?

    <p>Equation 5.9a</p> Signup and view all the answers

    In the context of Solution 7.2, what does C1 represent?

    <p>Composition of element 1 in wt.%</p> Signup and view all the answers

    What does Nv/N represent in calculating the fraction of vacancies?

    <p>Fraction of vacancies</p> Signup and view all the answers

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