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April 20, 2014

Homework Help: density of Magnesium!

Posted by sandy on Friday, February 6, 2009 at 7:34pm.

Magnesium crstallizes in the hcp arrangment. The dimensions of the unit cell are height 520om, length on an edge, 320. Calculate the density of Mg (s) and compare it with the measured value of 1.738 g/cm^3

this is what i did :

m= 2* 24.30g/6.022*10^23 = 8.07*10^-23

v= l^2*h
v= (320)^2*520= .0053248

d=m/v
d= 8.07*10^-23/. 0053248
d= 1.51* 10^-20 cm


BUT the answer is suppose to be 1.75
I think I made a mistake on the volume :S

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