Chemistry, 04.07.2019 17:30, asra44

Pennies used to be made of copper and zinc and had a mass of of 3.1 g. today pennies are made of copper-platted zinc and have a mass of 2.5 g. a new penny's mass is what percent of an old penny's mass?

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Pennies used to be made of copper and zinc and had a mass of of 3.1 g. today pennies are made of cop...