No' of molecules divide by avogadro number , 6×6.023×10^23 so (2.2×10^22)÷(6.023×10^23)
= 0.03653 moles 
moles × Molar mass = mass
n×Mr=m 
0.03653×40 = 1.46 grams
        
                    
             
        
        
        
Answer:
0.83 mL
Explanation:
Given data
- Initial concentration (C₁): 12 M
 
- Final concentration (C₂): 1.0 M
 
- Final volume (V₂): 10.0 mL
 
We can calculate the initial volume of HCl using the dilution rule.
C₁ × V₁ = C₂ × V₂
V₁ = C₂ × V₂ / C₁
V₁ = 1.0 M × 10.0 mL / 12 M
V₁ = 0.83 mL
The required volume of the initial solution is 0.83 mL.
 
        
             
        
        
        
Topsoil  because  plants and decaying animals add more humus to the soil
        
             
        
        
        
Answer:
Radio waves were first developed in WWII
Explanation:
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