This is for Chemistry 122

Question

A 4.00 cm piece of copper wire has a mass of 2.00 g. What is the mass if the length of the wire is 2.75 km?

Answer 1

For this question, the problem statement gives you a relation between the length of a copper wire, and the mass of that length. Given that relationship, you can set up a proportion to determine the mass of different of copper wire. Just be cautious when dealing with different unit of length.