Post-1982 pennies are 97.5% zinc and 2.5% copper. The density of zinc is 7.13 g/ml and the density of copper is 8.92 g/ml. Calculate the accepted density of a post-1982 penny. Show work. Thanks!
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Assume you have 100..0 g of pennies.
You would have
97.5 g of zinc
2.5 g of copper
97.5 g x 1 mL /7.13 g = 13.7 mL
2.5 g x 1 mL/8.92 g = 0.28 mL
Total volume = 13.7 + 0.28 = 13.98 mL
Density = m/V = 100.0 g / 13.98 mL
Density = 7.15 g/mL
You would have
97.5 g of zinc
2.5 g of copper
97.5 g x 1 mL /7.13 g = 13.7 mL
2.5 g x 1 mL/8.92 g = 0.28 mL
Total volume = 13.7 + 0.28 = 13.98 mL
Density = m/V = 100.0 g / 13.98 mL
Density = 7.15 g/mL