The mass will be 11 * 2.5 = 27.5 grams.
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Grams
The mass of a single penny is approximately 2.5 grams. Therefore, the mass of 20 pennies would be 20 times 2.5 grams, which equals 50 grams.
25.0 grams
paper clips do not weigh much, perhaps a gram each, so 10 weigh about 10 grams, so you would use grams, not kilograms, since 1 kg = 1000 grams
6 liters of water weigh approximately 6000 grams. A penny weighs about 2.5 grams. So, to find how many pennies have the same mass as 6 liters of water, you would divide 6000 grams by 2.5 grams per penny, which is 2400 pennies.
grams
Grams
25.0 grams
The mass of a penny is approximately 2.5 grams. To make 5 grams, you would need 2 pennies, as 2.5 grams x 2 = 5 grams.
Copper pennies (95% copper, 5% zinc) weigh 3.11 grams. Modern zinc pennies (97.5% zinc, 2.5% copper) weigh 2.5 grams.
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.
On Earth, 453.593 grams of mass (rounded) weigh one pound.
Mass is measured in grams, not weight.
Newer pennies actually have less mass than older ones. U.S. cents minted before 1982 were mostly copper and weigh 3.1 grams, while newer ones are mostly zinc and weigh 2.5 grams.
87,089.735 grams = 192 pounds.
39 grams is equivalent to....a mass of 39 grams !