What is the mass of #"10 m"^3# of water given that water has a density of #"1 g/cm"^3# ?
The mass of that much water will be equal to
Notice that you were given a volume of water,
The only thing you need to do to determine the mass of water is to use the water's density.
Density is defined as mass per unit of volume. In water's case, you know that 1 gram of water occupies exactly
In one single step, you would get
Another way to look at this is
Since you're given volume, you can determine the mass in grams first, then convert it to kilograms.
Expressed in kilograms, you'd once again get