Question

What is the mass of an object if the density is 7.85g/l and the volume is 41.25ml

Answer 1

The density is the ratio between mass and volume. So the mass is the product between density and volume. But! You have to control the units of measure.

7.85 g/l = 0.00785 kg/l

41.25 ml = 0.04125 l

Mass = (0.00785) x (0.04125) = 0,00032381 kg ---> 0,32381 g

(I hope this is right )