Question 1196485
volume,  {{{(4/3)pi*6^3=216(4/3)pi=(288/3)pi=96pi}}} cubic centimeters


The mass,
Density must use grams per CUBIC CENTIMETERS.  
7.874 grams per CUBIC centimeters


{{{96*pi*cm^3*7.874*(grams/cm^3)=youcandothisyourself}}}


Want as kilograms, then 1000 g = 1 kg



{{{96*pi*cm^3*7.874(grams/cm^3)*(1/1000)*(kg/grams)}}}


2.37 kilograms to three significant figures