Asked by Anonymous

the metal gold, with an atomic radius of 144.2pm crystallizes in a face-centered cubic lattice. what is the density of gold?

Answers

Answered by DrBob222
What is it you don't understand about this problem. We can take it from there. Post any work you've done on this problem.
Answered by Anonymous
volume=1.442x10^-8cm
4atoms per cell so,
4x (1/6.022x10^23) x 196.97g = 1.31x10^-21 g of gold
cell volume=(1.442x10^-8cm)^3= 2.99x10^-24
density=(1.31x10^-21)/(3.0x10^-24)=438g/cm^3
Answered by DrBob222
144.2 pm = 1.442E-8 cm and that's the RADIUS.
volume of sphere is (4/3)*pi*r^3.
See if that gets you off on the right foot?
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