Spherical ball of lead has a diameter of 5.5 cm . what is the mass of the sphere if lead has a density of 11.34 g/cm3? (the volume of a sphere is (43)πr3 where r is the radius.)

To know the mass of the sphere given the density , we first define density as

D = Mass / volume

now we have a value of density but doesn't have volume so we compute for it using the given radius 5.5 cm

V = (4/3)πr^3 

so 
mass  =  D (volume)
mass = 11.34 ((4/3)π(5.5)^3 )

mass = 7902.96 g 

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That they are numbers and related to each other.