Chemistry <span title="help!!!!!!!!!!!!!!!!!!!!!?">help!!!!!!!!!!!!!!!!!!!!!...</span>

Question

a cube of platinum of edge length 0.080 mm (the density of platinum = 21.4 g/cm3)

i thought the answer was .011g after reducing it according to the significant figures.

Answer 1

I guess that you want the mas of the platinum cube?

Volume of cube in cm³ = 0.008 *0.008* 0.008 = 5.12*10^-7cm³

Density = mass/ volume

Mass = density * volume

Mass = 21.4*5.12*10^-7

Mass = 1.096*10^-5 grams

Mass = 1.1*10^-5g  (2sig fig)

Answer 2

.080 millimeters = 0.008 centimeters

(.008 centimeters)^3 = 5.12e-7 cm^3

5.12e-7 cm^3 x (21.4 g/cm^3) = 1.10e-5 grams