A British 1p coin has a mass of 3.56 grams, so 1 pound (currency) worth of pennies (that is, 100 of them) would have a mass of 356 grams. At normal Earth surface gravity this would correspond to a weight of roughly 3.49 N, or 12.6 ounces.
If you meant "how much does a pound (weight) of pennies weigh", then I'm sorry, if you don't know that a pound of pennies, or anything else, weighs a pound then I don't think we can help you.
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A Two Pence coin weighs 7.12 grams. There are 50 Two Pence coins in a Pound. One Pound worth of Two Pence coins weighs 356 grams.
One pound of anything weighs one pound.
95 grams
1 pound
Seriously, one pound of weed equals one pound.