6.17749 would be the mass
It requires more energy to boil an substance than to melt it (with special exceptions). When something is boiled you are furthering the distance between the already stretched out molecules which will require more energy to do so, also in most cases you will be creating a vapor from boiling which has a high kinetic energy value.
After 3 half lives it will be (1/2)^3 or 1/8 of original
so
1/8 times 10^8=1.25 x 10⁶ atoms left
Answer : The number of automobiles needed are, 
Explanation :
First we have to calculate the mass of blueberries.
As, 1.0 mole of blueberries contains
blueberries
So, 0.75 grams of blueberries contains
blueberries
Mass of blueberries =
Now we have to calculate the number of automobiles needed.
Number of automobiles needed = 
Number of automobiles needed = 
Number of automobiles needed = 
Thus, the number of automobiles needed are, 
Density = mass/ volume
mass= 9.6 g
Volume of the object = 13.2-10.0 =3.2 ml=3.2 cm³
1ml =1 cm³
D=9.6g/3.2 cm³ = 3.0 g/cm³