A U.S. penny, minted after 1982, is composed of 97.5% zinc and 2.5% copper by mass. The total mass of a penny is approximately 2.5 grams. Here's how you can calculate the amount of copper and zinc in a penny:

1. Calculate the mass of copper in a penny:

- Copper percentage = 2.5% = 0.025

- Multiply the total mass of the penny (2.5 grams) by the copper percentage (0.025):

0.025 * 2.5 grams = 0.0625 grams of copper

2. Calculate the mass of zinc in a penny:

- Zinc percentage = 97.5% = 0.975

- Multiply the total mass of the penny (2.5 grams) by the zinc percentage (0.975):

0.975 * 2.5 grams = 2.4375 grams of zinc

Therefore, a penny contains approximately 0.0625 grams of copper and 2.4375 grams of zinc.