Nowadays, white gold is often used for making jewelry. White gold 585-carat is an alloy of 58.5 °

Nowadays, white gold is often used for making jewelry. White gold 585-carat is an alloy of 58.5 ° / o gold, 26 ° / o silver, 15.5 ° / o palladium. Calculate the mass of pure gold in such a ring weighing 4.2 g, adorned with 25 diamonds with a total weight of 0.25 carats (1 carat = 0.2 g)

These tasks: kAu (percentage of gold in the metal part in the considered ring) = 58.5% = 0.585); m (total mass of the ring) = 4.2 g; m1 (total mass of diamonds in the ring) = 0.25 ct = 0.05 g.

1) The mass of the metal part of the ring under consideration: m2 = m – m1 = 4.2 – 005 = 4.15 g.

2) Mass of pure gold: mAu = m2 * kAu = 4.15 * 0.585 ≈ 2.43 g.

Answer: The mass of pure gold in the indicated ring is 2.43 g.