For a liquid or a solid the density is defined as the ratio of the density of the solid or the liquid by that of the water (1g / cm3) .
the calculation formula that relies density, mass and volume is: d = m / v
To calculate the mass: m = d. v = 0.835 g / cm3 x 34 cm 3 = 28.39 g.
So, the mass of the object is 28.39g.