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# hw1f08 - the gold atoms in a solid piece of gold metal 2...

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HW Set #1 Due 9/9/08 (at the beginning of class) Work the following problems from chapters 1 Chapter 1 2, 10, 14, 18, 22, 24, 26 Other problems. 1. Calculate the density of one Au atom by assuming it is a sphere of radius 1.35 x 10 -7 m (you’ll need to calculate the mass of one gold atom. You can calculate the average mass based on the relative abundance of the isotopes). Give your density in terms of g cm -3 . Metallic gold has a density of 19.3 g cm -3 . What does this say about the packing of
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Unformatted text preview: the gold atoms in a solid piece of gold metal? 2. The grain is an archaic mass unit that was based on a the weight of a barley grain. (There are 24 grain in a pennyweight and a 20 pennyweight in a troy ounce). Assuming we lived in a world where such measures still reigned supreme determine the value for Avagadro’s number if it were defined as the number of carbon atoms in 12 grains of carbon. (1 troy ounce = 31.1035 g)...
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