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November 27, 2014

November 27, 2014

Posted by **sam** on Monday, January 24, 2011 at 6:51pm.

Calculate the atomic mass of the metal.

Im not sure how to approach this problem...when i tried doing it i got an answer of 3.1*10^-7..but it was hard...can someone please explain how to do this problem

thank you

- chemistry -
**DrBob222**, Tuesday, January 25, 2011 at 12:34amConvert a in nm to cm.

Then volume of the unit cell is a^3.

mass of unit cell = volume x density

Calculate mass unit cell since you have volume and density. Substitute for mass of unit cell below.

Then mass of the unit cell =

#atoms in unit cell which is 2 x molar mass/6.022E23

a = (3.1627E-8 cm)^3 = about 3E-23 cc but you need to do it more exactly.

mass = volume x density = about 3E-23 cc x 19.3 g/cc = about 6E-22.

Then 6E-22 = 2*molar mass/6.022E-23 = and solve for molar mass. I get something like 180 but you need to do it more accurately. My guess is W.

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