The mass of 10 cm^3 of iron is 79 g. what is its density?

d = 7.9 g/cm^3

Identify the given information. 
m = 79 g
v = 10 cm^3

Choose which formula you should use. In this case, you are finding the density.
d = m/v

Substitute and solve.
d = 79 g/10 cm^3
d = 7.9 g/cm^3

We can solve this problem by using the density-mass-volume relationship:

Density=mass divided by volume

7.9 =25.28 divides by v

V= ( 25.28 divided by 7.9 )
V= 3.20cm^3

Therefore, 25.28 g of iron, with a density of
7.9 g divided by cm^3

occupies a volume of 3.20cm^3