4. The half-life of strontium-90 is 28 years. If 140 years pass, how much if left of a
500 g
sample?

Agas is contained in a thick walled balloon when the pressure changes from 1.21 atm to 2.52 the volume changes from 3.75 l to 1.72 l and the temperature change from 293k to blank k

In which phase(s) do the molecules take the shape of the container?

How to convert a density of 0.791g/cm3 to lb/ft3