Answer: There are
molecules present in 6.71 moles of
.
Explanation:
Given: Moles of
= 6.71 mol
According to the mole concept, 1 mole of every substance contains
molecules.
Therefore, molecules present in 6.71 moles are calculated as follows.

Thus, we can conclude that there are
molecules present in 6.71 moles of
.
A rapid release of stored up energy
The answer is Ra
Atomic number for Be is 4
Atomic number for Mg 12
Atomic number for Ra 88
Atomic number for Ba 56
8.................................