Question

A penny isn't really made from much copper anymore. In fact it is zinc that is plated with copper

on the outside. A penny has a mass of 2.5 g and 2.43 g of it is zinc. What is the percent
composition of copper in the penny?
O 2.5%
O 1.2%
O 97.5%
O 98.8%"

Answer 1

The percent composition of copper in the penny is 2.8%.

Step-by-step explanation:

The percent composition of copper in the penny can be calculated by subtracting the mass of zinc from the total mass of the penny and dividing it by the total mass, then multiplying by 100 to get the percentage.

Given that the penny has a mass of 2.5 g and 2.43 g of it is zinc, the mass of copper can be calculated as 2.5 g - 2.43 g = 0.07 g.

Therefore, the percent composition of copper in the penny is (0.07 g / 2.5 g) x 100 = 2.8%. So the correct answer is 2.8%.