Assertion: ounce | /r/HasProperty | exactly 31.1034768 grams
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Source sentences:
text: A possible source of confusion is that gold is often priced on the open market in the more traditional troy ounce (one troy ounce is exactly 31.1034768 grams, which is larger than the avoirdupois ounce generally in use in the United States and has a mass of 28.35 grams).