Assuming that a neutron star has the same density as a neutron, calculate the mass (in kg) of a small piece of a neutron star the size of a spherical pebble with a radius of 0.20 mm.
NOTE: The density in the previous part of this question was found to be 4.0 * 10^14 g/cm^3 based on the following question: Assume the radius of a neutron to be approximately 1.0 * 10^-13 cm, and calculate the density of a neutron.
So, it seems like you need the density info to solve the question I'm posing to you, but I can't figure it out.