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- A high-leaded brass that has a composition of 65.5 wt% Cu, 32.0 wt% Zn, and 2.5 wt% Pb with density equal to 8.94 g/cm^3, 7.13 g/cm^3, and 11.^35 g/cm3, respectively. Determine its approximate density Write up to 3 decimal places. Determine the atom percent (%) of lead. Atomic weights: Cu-63.55 g/mol ;Zn-65.41 g/mol ; Pb-207.2 g/mol Write up to 3 decimal places.A:08 الرسائل المحفو. . . 1 03: Rhenium has a Hexagonal Close-Packed crystal structure with an atomic radius of 0.137 nm and a ratio c/a of 1.615, compute: a) The volume of the unit cell. b) The theoretical density c) Atomic packing factor Note: Avogadro's' number = 6.023×10²³ Atomic weight = 186.21 g/mol إضافة وصف.. . IIIb. Why is the final product a helium atom? Explain.
- The force constant of HCl is 0.0482 N/m. a) Calculate its vibrational frequency. b) How much does the frequency change if hydrogen is replaced by deuterium?Niobium has a BCC crystal structure, an atomic radius of 0.143 nm and an atomic weight of 92.91 g/mol. Calculate the theoretical density for Nb. a. Compute its theoretical density. b. What is the percentage error between the theoretical density and the actual density? The actual density of Nb is 8.57/cm318. What is the range of carbon concentrations for steels? * 4.3...6.67% 0.8...6.67% 0.8...2.14% 0.05...2.14% 2.14...4.3% 19. Which of the steels is hypereutectoid steel? * AISI 2024 (GOST A16) AISI 1045 (GOST 45) AISI 5130 (GOST 30X) AISI W1-13 (GOST Y13) AISI 1008 (GOST 08)
- Which of these statements referring to ionization energy is INCORRECT? A. For Na, I2 < l1 B. lonization is an endothermic process C. Helium has the highest ionization energy of all the noble gases. D. Of the elements Rb, Sr, Sb and Cs, lonization energies increase in the order: Cs < Rb < Sr < Sb6. Assume the following sequence is geometric: 6,9, 13.5.. a. Create a table for this sequence. y b. What is the common ratio? What is the zero term? c. Write the equation for y =Suppose that a semiconductor device is using a 10.51-mg sample of a hypothetical element By, that is doped with 0.8 % (by mole) of another hypothetical element Do. How many Do atoms are in the sample? Atomic Mass: By: 26.274 g/mol Do: 82.183 g/mol a. 3.75e+18 b. 4.64e+18 c. 1.93e+18 d. 2.84e+18
- The diameter of a carbon nanotube is 1.3 nm. This diameter in S.I. system is O a. 13 x 10m O b. 1.3X 10 cm Oc 13X 1012 cm Od. 1.3 x 10mWhat is the relationship between the length of the face diagonal and the radius, r, of the atoms in the cell? (Enter a mathematical expression.) face diagonal = (c) How is the radius of the atoms related to do? (Enter a mathematical expression.) r = (d) Gold metal crystals have an FCC structure. The unit cell edge in gold is 0.4078 nm long. What is the radius (in nm) of a gold atom? nm2A. Calculate Z and V for sulfur hexafluoride at 75 °C and 15 bar by the following equations: a) Truncated virial eqn. 3.39 w/ B = -194 cm³/mol & C = 15,300 cm/mol² b) Redlich/Kwong eqn. c) The Soave/Redlich/Kwong equation d) The Peng/Robinson equation For sulfur hexafluoride, Tc= 318.7 K, Pc=37.6 bar, Vc= 198 cm³/mol and o = 0.286. ww www