King & Queen of Rings

Sterling Silver Jewelry

How many copper atoms are present in a piece of jewelry in sterling silver weighing 33.24 grams?

(Silver is an alloy of silver copper containing 92.5 wt% Ag)

33.24 * (1 -, 925) = 2.493 g or 2.493 grams of copper in the alloy. The mass of 1 mole of atoms copper is 63.546 g 2.493 / 63.546 = 0.039231422906241148144651118874516 moles 1 mole contains 6.02 * 10 ^ 23 atoms: 23 617 316 589 557 171 183 080 atoms, or 2. 361 731 658 955 717 118 308 x 10 ^ 15 atoms

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