Answer
1.07$\times$10^${6}$ kg
Work Step by Step
1. calculate the volume of a neutron by using V=$\frac{4}{3}$π$r^{3}$ and substituting in given variables
2. calculate density by using d=$\frac{m}{v}$ and substituting m with given variable and v for volume found in previous step
3. calculate volume of neutron star by using V=$\frac{4}{3}$π$r^{3}$
