Answer:
GOOD MORNING DIDI be happy
 
        
                    
             
        
        
        
Answer:  600 kJ
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Explanation:
                         C₃H₈ (g)  + 5 O₂ (g) =============== 3 CO₂ (g)  +  4 H₂O (l)
Δ⁰Hf   kJ/mol       -104             0                                       -393.5         -285.8
Δ⁰Hcomb C₃H₈ = 3(-393.5) + 4 (-285.80) - (-104)  kJ/mol
Δ⁰Hcomb = 2219.70 kJ/mol
n= m /MW   MW c₃H₈ = 44.1 g/mol
n= 12 g/44.1 g/mol = 0.27 mol 
then for 12 g the heat released will be
0.27 mol x 2219.70 kJ/mol =  600 KJ
 
 
        
                    
             
        
        
        
Answer: 
 
Explanation:

Multiply by t on both sides.


Now divide by I to isolate t.


 
        
             
        
        
        
Answer:

Explanation:
Henry's law states that the solubility of a gas is directly proportional to its partial pressure. The equation may be written as:

Where  is Henry's law constant.
 is Henry's law constant.
Our strategy will be to identify the Henry's law constant for oxygen given the initial conditions and then use it to find the solubility at different conditions.
Given initially:

Also, at sea level, we have an atmospheric pressure of:

Given mole fraction:

According to Dalton's law of partial pressures, the partial pressure of oxygen is equal to the product of its mole fraction and the total pressure:

Then the equation becomes:

Solve for  :
:

Now we're given that at an altitude of 12,000 ft, the atmospheric pressure is now:

Apply Henry's law using the constant we found:

 
        
             
        
        
        
Answer:

Explanation:
From the question we are told that:
Slope 
initial Concentration 
Time 
Generally the equation for Raw law is mathematically given by


