Answer :
Answer:
6.07 mol
Explanation:
We know that 1 mole of every substance contains a number of molecules equal to Avogadro Number, which is:
[tex]N_A=6.022\cdot 10^{23}[/tex]
In this problem, we have [tex]n[/tex] moles of dinitrogen pentoxide, and these n moles contain a number of molecules equal to
[tex]N=4.2\cdot 10^{24}[/tex]
This means that we can find the number of molecules in this substance by using the following rule of three:
[tex]\frac{1 mol}{N_A}=\frac{n}{N}[/tex]
where n is the number of moles that we want to find. Solving for n, we find:
[tex]n=\frac{N}{N_A}\cdot 1 mol = \frac{4.2\cdot 10^{24}}{6.022\cdot 10^{23}}\cdot 1 mol =6.97 mol[/tex]
So, the answer is 6.97 moles.