Question

Determine a massa, em kg, de um material que está contida em um volume de 18L. Sabe-se que a densidade do material é de 0,9 g/cm3

Answer 1

The question in English is "Determine the mass, in kg, of a material that is contained in a volume of 18L. It is known that the material density is 0.9 g/cm 3"

Answer: 

We can use a simple equation to solve this problem. 
    d = m/v

Where d is the density, m is the mass and v is the volume.

d = 0.9 g/cm³
m = ?
v = 18 L = 18 x 10³ cm³

By applying the equation,
    0.9 g/cm³ = m / 18 x 10³ cm³
                  m = 0.9 g/cm³ x 18 x 10³ cm³ 
                  m = 16200 g
                  m = 16.2 kg

Hence, the mass of 18 L of material is 16.2 kg.