Posted by hillary on Wednesday, March 16, 2011 at 9:09pm.
gold hasa density of 19 g/cm^3 if an 18 inch necklace is made of pure gold how much would it weigh in grams if it is 1 cm wide and 1 mm thick

chem  drwls, Thursday, March 17, 2011 at 6:38am
Compute the volume in cubic centimeters.
V = (18*2.54)*1.0*(0.1) = 4.57 cm^3
Then multiply that by the 19 g/cm^3 density for the mass in grams. It is about 8.69 g. That is about 1/4 Troy oz.
Most gold necklaces are not rectangularprism blocks; they are chains, with void spaces to allow greater flexibility. The calculation indicated above is an approximation.
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