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Current US pennies (cents, actually) weigh 2.5 gm each. An American ounce is 28.35 gm so the calculation is (2 * 28.35) / 2.5 = 22.68. So, you'd need 23 whole pennies to weigh at least 2 ounces.
Wiki User
∙ 12y ago
Wiki User
∙ 11y agoIt would take nearly five dollars worth of pennies ($4.976).
The current US cents weigh 2.5 grams but are only 2.5% copper (plated zinc).
This means there is only 1/16 gram of copper in each cent, so it would take 16 to yield a gram of copper and 497.6 pennies to yield a troy ounce of copper.
(31.1 grams per troy ounce, compared to 28.35 grams for an avoirdupois ounce)
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