<span>i get 3.19x10^20 atoms 
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Yea! what the person underneath me said
        
             
        
        
        
Answer:
A control group is someone who takes control over something so a tyrant or a dictator. 
Explanation:
If this isnt what your looking for let me know, there wasnt alot of context. 
 
        
                    
             
        
        
        
First. moles is just a label for a number of things. just like a
dozen = 12, a gross = 144, a mole = 6022 with another 20 zeros after the
2 
next 
moles = mass / molecular weight. 
molecular weight = sum of atomic mass from the periodic table 
atomic mass MnO2 = atomic mass Mn + 2 x atomic mass O 
= 54.94 + 2 x 16 = 86.94 g/mole 
so moles MnO2 = 98.0 grams / (86.94 g/mole) = 1.13 moles 
notice that I only gave 3 digits? that because of sig figs read the link below if you don't understand.... 
mw C5H12 = 5 x 12 + 12 x 1 = 72 g/mole 
so moles C5H12 = 12.0 g / 72.0 g/mole = 0.167 moles 
mw XeF6 = 131.3+ 6 x 19.00 = 245.3 
so moles XeF6 = 100 g / 245.3 g/mole = 0.4077 moles 
I've also provided a link to a periodic table. if you need atomic weights click on any element and it will give you the 
details. 
        
             
        
        
        
1. B
2. C
3. E
4. D
5. A
6. B
7. A
8. E
9. A
Hope this helps!