Copper is now available which is 99.99999% pure. At this purity, what mass of wire will contain 1.0g of impurities?

Answer 1

100 - 99.99999 = 0.00001 % impurites

0.00001% (x) = 1.0 g

x = 10,000,000 g = 1.0x10⁶ g = 1.0x10³ kg (to 2 significant figures)