One cent (minted 1982-present) weighs 2.5 grams. 50 of them weigh 125 grams.
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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.
Fifty cents.
Depends on whose pennies (which country) and the force of gravity which is not uniform.
167,500 grams
50 pennies or fifty cents are in a fifty cent piece or a half dollar.