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Please help. Which is correct:

Acetaminophen, 0.5 grams
or
Acetaminophen, 0.5 gram

They are read Acetaminophen zero point five grams/gram

The 0.5 is never refered to as five tenths of a gram.

Thanks for your help.
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Either of these is OK:

Acetaminophen zero point five grams.

Acetaminophen zero point five of a gram.