How many ounces of gold are in a 16-karat gold chain that weighs 2.1 ounce?

To calculate the amount of pure gold in a 16-karat gold chain, you need to determine the proportion of pure gold in 16-karat gold. Since 24-karat gold is pure gold, each karat represents 1/24th part of pure gold. Therefore, 16-karat gold is (16/24) = 2/3 pure gold. Multiply the weight of the chain (2.1 ounces) by the proportion of pure gold to find the weight of pure gold in the chain. In this case, 2.1 ounces * 2/3 = 1.4 ounces of pure gold.