Question

Steel has a density of 8 g/cm3. What is the mass of a block of steel with a volume of 400 cm3?

Answer 1

First step is to mark everything you have;
density=8 g/cm3
volume= 400cm3
Now let's see what do you miss;
mass=?
density=mass/volume
What leads to;
mass=density x volume
mass= 8g/cm3 x 400cm3
mass=3200g=3.2 kg

Answer 2

3200g is the volume