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Answer:
n₁ = 1.0× 10⁻⁴ mol
Explanation:
Given data:
Initial volume of balloon = 230 mL
Initial number of moles of He =?
Final number of moles of He = 3.8 × 10⁻⁴ mol
Final volume of balloon = 860 mL
Solution:
The given problem will be solve through Avogadro law,
"Number of moles of gas and volume are directly proportional to each other at constant temperature and constant pressure"
Mathematical relationship:
V₁/n₁ = V₂/n₂
No we will put the values.
230 mL  /n₁   = 860 mL/ 3.8 × 10⁻⁴ mol
n₁ = 230 mL× 3.8 × 10⁻⁴ mol/ 860 mL
n₁ = 874 × 10⁻⁴ mol. mL / 860 mL
n₁ = 1.0× 10⁻⁴ mol
 
        
                    
             
        
        
        
The answer is atom because it cannot be broken down into small substances
        
             
        
        
        
Answer:
Molecular formula of aniline is C6H5NH2.
Explanation:
As we know, molecular mass can be calculated as
Molar mass =  C6H5NH2
 Molar mass = (6*12)+(1*7)+(28)
Molar mass  = 93 g/mol