1 troy ounce = 31.1034768 grams
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31.1034768 grams exactly.Gold is measured in troy ounce( and not inavoirdupois ounce( which is 28.3495 gm).
U.S. quarters minted before 1965 weighed 6.25 grams and contain 90% silver, which comes out to 5.625 grams of silver per coin. One ounce is about 28.35 grams, so it would take five quarters to get one ounce (5.04 coins, to be more exact).
if a silver dollar is 90% silver it would take 1 and 1/10th silver dollars to make an ounce of silver
The U.S. Mint does NOT make any gold presidential 1 dollar coins. So none can make an ounce of gold.
There are 1,000,000 micrograms in a gram. Therefore you have to divide 5000 by 1,000,000. 5000/1000000 is 0.005 grams.