A certain application requires a material that is lightweight, an electrical ins

Question

A certain application requires a material that is lightweight, an electrical insulator, and has some flexibility. Which class of materials would you search for this selection? Explain your answer from a bonding point of view. Sterling silver contains 92.5 wt% silver and 7.5 wt% copper. Copper is added to silver to make the metal stronger and more durable. A small sterling silver spoon has a mass of 100 grams. Calculate the number of copper and silver atoms in the spoon. A Monel alloy consists of 70 wt % Ni and 30 wt % Cu. What are the atom percentages of Ni and Cu in this alloy?

Explanation / Answer

2. sterling spoon mass = 100 g

Of which 92.5 g is silver and 7.5 g is copper

number of atoms of silver = 92.5 x 6.023 x 10^23/107.9

                                          = 5.16 x 10^23 atoms

number of atoms of copper = 7.5 x 6.023 x 10^23/63.55

                                            = 7.11 x 10^22 atoms

3. Alloy contains

70 wt% Ni and 30 wt% Cu

atom percentage Ni = [70 x 63.55/(70 x 63.55 + 30 x 58.7)]100

                                 = 71.64 atom%

atom percentage of Cu = [30 x 58.7/(70 x 63.55 + 30 x 58.7)]100

                                 = 28.36 atom%

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.