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25 Jun 2020

A gold sample contains 90% gold, and the rest is copper as an impurity. How many atoms of gold are present in one gram of this gold sample? Atomic mass of Au = 197 g/mol.

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AP Chemistry
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Solve problems involving atoms
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Related questions

3. A biology student has just come back from a spelunking trip and gives you a crystal he found. He wants to find out whether this is gold or just Fool’s gold. You suggest using XRD to distinguish the two materials. You find out that Fool’s gold is FeS2 and has a cubic structure. The peaks with the highest d spacings are 2.355 à and 3.128 à for Au and FeS2, respectively, and both peaks have identical (hkl) indices. a) Calculate the lattice parameter for Fool’s gold. b) How much lighter will the nugget be if it is Fool’s gold, compared to gold (assume that Fool’s gold has the same # of molecules/unit cell as gold has atoms/unit cell)? c) Sketch the (200) plane in a unit cell of Au and give the number of atoms in that plane. d) Sketch and label a direction within the Au unit cell that has the maximum linear density (i.e., the maximum number of atoms/unit length of line).

A 5 nm film of gold is vapor deposited onto a 1 mm thick silver substrate. This sample is annealed at a constant temperature of 1100K, at which the diffusivity of Au in Ag is 10^-11 cm²/sec. Gold and silver are completely miscible, are FCC metals, with a lattice constant of 0.4 nm (assume identical atomic volumes). How long does it take for the concentration of Au at the surface to drop to 10 atomic % ?

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