samithegoat samithegoat

25-10-2018
Chemistry

contestada

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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dtraynor16 dtraynor16

25-10-2018

A new penny’s mass is 80.64% of an old penny’s mass.

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