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1. There is 0.9 at% copper at the surface of aluminum and 0.18 at % of copper 1.2 mm underneath the surface. What will the flux of copper atoms be from the surface inward at 500 C? (Aluminum is fcc and a=0.4049 nm at 500 C) D0 = 0.15 10-4 m2/s, Q=30200 cal/mol, or E= 0.210 10-10 j/atom.
2. The diffusivity of aluminum in copper is 2.6 10-17 m2/s at 500C and 1.6 10-12 m2/s at 1000C.
(a) What are the values of D0 and E for this diffusion couple?
(b) What is the diffusivity at 750C?
(c) Did you realize that the diffusivity of copper through aluminum is higher than diffusivity of aluminum in copper. Why do you think is this?
Hydroxyapatite is the major mineral constituent of bone. The unit empirical formula for hydroxyapatite is Ca5(PO4)3(OH). List the elements found within hydroxyapatite in alphabetical order, written in lower case letters, and separated by commas and s..
Is strategic behavior important in this market pharmaceutical drugs. Avoid answering any of the questions with a quote.
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A gaseous mixture containing 0.220 mol fraction of carbon tetrachloride (CCl4) and 0.780 mol fraction of dry air is initially at 75.0°C and 1117 mmHg
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