Weight of water:
1 imperial fluid ounce = 28.41 grams
1 US fluid ounce = 29.57 grams
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about 31.1 grams
The answer to this cannot be determined without knowing what is being measured or weighed. For example, a fluid ounce of water will weigh much less than a fluid ounce of mercury.
Lots of objects weigh 30 grams, it's just over one ounce.
26 grams
Depends on their dates. Pennies before 1982 weigh 3.11 grams. Pennies from 1983 to now weigh 2.5 grams. Pennies dated 1982 could weigh either amount. An ounce equals 28.35 grams. Separate your coins into piles by date and get out your calculator.