The density of osmium, which is the densest metal, is 22.57 g/cm3. What is the mass in kg of a block of osmium that measures 1.00 cm x 4.00 cm x 2.50 cm?

0.2257kg

Explanation:

Using the formula density= mass/ volume

density=22.57g/cm³volume=1*4*2.5cm³= 10cm³mass is unknown

22.57g/cm³=mass/10cm³

cross multiply

mass = 22.57g/cm³*10cm

=225.7g

but in kg

convert to kg225.7/1000

= 0.2257kg

The mass has escaped into a gas which you can not see so the law stays true.

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water