Homework Help: Chemistry

Posted by ChemLover on Saturday, May 14, 2011 at 11:24pm.

Silver crystallizes in a face centered cubic unit cell with an edge length of 0.40836 nm. Calculate the density of silver in grams per cubic centimeter

i know the answer is 10.5 g/cm^3 but i keep getting lost in figure it out.

Chemistry - DrBob222, Sunday, May 15, 2011 at 12:03am
mass of mole Ag atoms = 107.868. Mass of 1 atom = 107.868/6.022E23 = ??
?? x 4 atoms/unit cell = mass unit cell in grams.
Then density = grams/volume where volume = (0.40836E-7 cm)^3

I obtained 10.52 g/cc.
Chemistry - ChemLover, Sunday, May 15, 2011 at 12:31am
for some reason i keep getting 2.63

i got 1.79 x 10^-22 g / 6.823 x 10-23 cm^3

and i keep getting 2.63...what an i doing wrong???
Chemistry - ChemLover, Sunday, May 15, 2011 at 12:34am
ohhhh never mind i forgot to multiply by 4....thank you

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