use a scale
312.5g
100 pennies = 100¢ = $1.00
grams
Grams
Yes, the mass of 10 pennies is equal to the mass of 10 times one penny. This is because mass is additive, meaning that the total mass of multiple objects is the sum of their individual masses. Therefore, 10 pennies will have the same mass as 10 multiplied by the mass of one penny.
25.0 grams
a scale
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.
The mass of a single U.S. penny is approximately 2.5 grams. Therefore, the mass of 100 pennies would be about 250 grams. This is equivalent to around 0.25 kilograms.
The metric unit for mass is the kilogram. For smaller masses, as in this case, you may also use grams or milligrams.
The new pennies have less mass because they are now mostly made of zinc with a thin copper coating, while the old pennies were made of bronze. The change was made to reduce production costs and to make the coins more affordable to produce.
The mass will be 11 * 2.5 = 27.5 grams.