A 400 troy ounce gold bar is the standard in gold trading. The U.S. Mint reports that a standard gold bar weighs 27.5 pounds, or 12.5 kg. It measures 17.78 cm by 9.21 by 4.45 cm. What is the density of golf in g/mL? Knowing that the density of gold is 19.3 g/mL, is this pure gold?