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Approximately 5 lbs
A post-1982 penny in the US weighs 2.5 grams, so 100,000,000 of them would weigh 2,500,000,000 grams, or 2,500,000 kilograms, or 5,500,000 pounds.
Weigh? mass in kilograms or pounds.
You could (theoretically) use either... However - Kilos is the preferred measurement.
kilograms because kilo means 1000