Answer:
A physical property is any property that is measurable, whose value describes a state of a physical system.
Explanation:
-color
-density
-volume
Aluminum is 26.982 grams per mole, so 26.982/19.9 will give you the moles 1.3558794
Answer:
Two Half-lives
Explanation:
Let number of Parent nuclei Initially present be X,
Then, finally
Parent nuclei Will remain with
daughter nuclei.
In one half- life , parent nuclei becomes half of initial.
So, starting with X parent nuclei,
After one half-life, it will degrade to
.
After another half life , Parent nuclei will become half of
Which is equal to
.
So, Parent nuclei have to go through Two half-lives.