Karat Gold
How many moles of gold are in a ring that has 6.50 g of 18 karat gold?
Also, how many atoms are there?
Pure gold is 24 karats, so an 18 karat ring is 75% gold. One mole of gold is about 197 g.
So 6.50 g * (1 mol / 197 g) * 0.75 = 0.0247 mol gold
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