Calculate to the Correct Number of Significant Figures

Question

A metal has a mass of 40.000g. When the solid is placed in a graduated cylinder containing 20.0 mL of water, the water level rises to 30.5 mL. Calculate the density of the metal to the correct number of significant figures. (Show all calculations!)

Answer 1

40.000 g has 5 sig figs

20.0 ml has 3 sig figs

30.5 ml has 3 sig figs

density = mass/ volume

The mass is 40.000 g

Tge volume is 30.5 ml - 20.0 ml = 10.5 ml

Density = 40.000 g/10.5 ml = 3.8095 g/ml

# sig figs should be 3 so answer should be 3.81g/ml