A cubic piece of metal measures 4.50 cm on each edge. If the metal is nickel, whose density is 8.90 g/cm3, wha?

volume ---> (4.50 cm)^3 = 91.125 cm^3

mass of cube ---> 91.125 cm^3 times 8.90 g/cm^3 = 811.0125 g

to three sig figs, 811 g

Volume of the cubic piece of nickel
= (length of each edge)³
= (4.5 cm)³
= 4.5³ cm³

Mass of the cubic piece of nickel
= volume × density
= (4.5³ cm³) × (8.90 g/cm³)
= 811 g
(3 sig. fig.)

4.5^3 * 8.9 = 811.0125 grams