Juglone, a dye known for centuries, is produced from the husks of black walnuts. It is also a natural herbicide (weed killer) that kills off competitive plants around the black walnut tree but does not affect grass and other non-competitive plants. The formula for juglone is C10H6O3. A sample of 1.56 x 10-2 g of pure juglone was extracted from black walnut husks. How many moles of juglone does this sample represent?