The net weight of the gold in US modern commemoratives is 0.241873 troy ounces (with troy being the key word).
Precious metal weights are measured in "troy ounces" which weigh 31.1034768 grams vs. the "standard ounce" of the avoirdupois system which weighs 28.3495231.grams.
The gold coin's math:
A. 8.359 grams * 0.90 = 7.5231 grams
B. 7.5231 grams / 31.1034768 grams (1 troy ounce) = 0.241873 troy ounces
Precious metal weights are measured in "troy ounces" which weigh 31.1034768 grams vs. the "standard ounce" of the avoirdupois system which weighs 28.3495231.grams.
The gold coin's math:
A. 8.359 grams * 0.90 = 7.5231 grams
B. 7.5231 grams / 31.1034768 grams (1 troy ounce) = 0.241873 troy ounces
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