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Assuming the dimes are all dated 1965 or later, each one weighs 2.27 gm. Any dated 1964 or earlier weigh 2.5 gm.
Diameter: 30.6 mm Thickness: 2.15 mm Weight (current): 11.34 gm; (40% silver): 11.5 gm; (90% silver): 12.5 gm
17.5%
For converting gms and kgs into each other we must know the relation between them . We can say 1 kg =1000 gm. So, 2.188 kg is 2188 gm. there are 4.376 500 gm in 2.188 kg.
The last US half dimes were minted in 1873.If you're referring to a Mercury dime, these weighed 2.5 grams and were 90% silver so they contain 2.25 gm of pure metal.If you're referring to a "war nickel" with a large mint mark over the dome of Monticello, these are the only US nickels that ever contained any silver. They weighed 5 gm and were 35% silver so they contain 1.75 gm of pure metal.