Question

What is the mass of a 1.00 cubic centimeter piece of iron having a density of 7.90 g/cubic centimeters?

Answer 1

7.90g/cm³ = 7.90g/1cm³ - this density means that 1 cm³ has mass = 7.90 g

Or you can do it another way

1.0 cm³*7.90 g/cm³= 7.90 g