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Hello, I am trying to find the density of iridium, but I do not understand how to find the volume using the information provided; could someone please help me with this problem?
Question: What is the density of iridium metal? (Ir: 192.2 g/mol; facecentered cubic with 3.83x10^8 cm edges).
 2 years ago
 2 years ago
Hello, I am trying to find the density of iridium, but I do not understand how to find the volume using the information provided; could someone please help me with this problem? Question: What is the density of iridium metal? (Ir: 192.2 g/mol; facecentered cubic with 3.83x10^8 cm edges).
 2 years ago
 2 years ago

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JFraserBest ResponseYou've already chosen the best response.2
You know 1 mole of iridium has a mass of 192.2g. How much should a single atom of iridium weigh? \[Mass = (\frac{192.2g}{1mol})*(\frac{1mol}{6.022*10^{23}atoms})\] Below is the figure for a facecentered cubic cell. There are 6 halfatoms and eight 1/8th atoms that make up this cell. How many atoms total is that? (4) Since you konw what a single atom weights, find out how much the atoms inside the cell weigh, and divide by the volume of the cell (since it's a cube, vol = length^3). I get about 22.3g/cm^3
 2 years ago

adeniytaBest ResponseYou've already chosen the best response.0
Thank you this was very helpful.
 2 years ago

adeniytaBest ResponseYou've already chosen the best response.0
I don't understand how you found the volume, could you please show the math you did?
 2 years ago

JFraserBest ResponseYou've already chosen the best response.2
the face centered cell is a cube. You are given the length of one edge of the cube. Volume is length x width x height. All 3 sides are the same, so the volume of the cube is (length)^3
 2 years ago
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