IDNLearn.com connects you with a global community of knowledgeable individuals. Our community is here to provide detailed and trustworthy answers to any questions you may have.

( prior to 1982 a penny was 95% copper. after 1982 the composition was changed to be mostly zinc with a small amount of copper plated on the surface. the official mass of a penny is 2.500 grams. calculate the average density given the composition of 97.500% zinc and 2.5% copper. you will need to research the densities of copper and zinc.