An ice block measuring 5cm by 5cm by 5cm has a desity of 5g/cm3. What is the mass of the ice block?

5cm*5cm*5cm=125cm^3

125cm^3*5g/cm^3=625g

The cm^3 cancel out

Density = (mass) / (volume)

Volume of your block = (5cm x 5cm x 5cm) = 125 cm³

5 gm/cm³ = (mass) / (125 cm³)

Multiply each side by (125 cm³) : Mass = 625 gm

Note:

I don't know what kind of frozen substance you're working with,

but maybe you ought to be careful handling it ... I know that's

not water ice you have there. The density of water ice is not

5 gm/cm³. In fact, it's a little less than 1 gm/cm³. That's why

the ice floats in your soda.