If the density of a solution is 3. 12 g mL-1 , the mass 1.5 mL solution in significant figure is …..

Given that, density of solution = 3.12 g mL-1Volume of solution = 1.5 mLFor a solution, mass = volume x densityThe digit 1.5 has only two significant figures, so the answer must also be limited to two significant figures. So, it is rounded off to reduce the number of significant figures.