Answer:
0.234 moles
Explanation:
moles of Al2O3 = mass / molar mass
moles of Al2O3 = 23.87g / 102.0g/mol
moles of Al2O3 = 0.234 moles (to three significant figures)
 
        
             
        
        
        
Answer:
The correct answer is B) HOOCCH2CH2COOH(aq)
Explanation:
Both Ka1 and Ka2 are low, so the acid will dissociate only slightly into HOOCCH2CH2COO- ions and even more slightly into -OOCCH2CH2COO- ions. The concentration of hydronium ions (H₃O⁺) will be consequently low. The species that will be in the highest concentration will be HOOCCH2CH2COOH (the weak acid not dissociated). 
 
        
             
        
        
        
Given that, 
The concentration of
TRIS = 0.30 M 
The concentration of
TRIS+ = 0.60 M 
Kb = 1.2 x 10^-6 
pKb = -log Kb = - log
(1.2 x 10^-6) = 5.920 
Now, by using the
Hendersonn equation,
pH = pKa + log
TRIS+/TRIS = 5.920 + log (0.60/0.30) = 6.221 
<span>pOH=14-pH=14-6.221 =
7.779</span>
 
        
                    
             
        
        
        
Answer:
I believe you are correct
thats because All of the 2nd choices seem to be larger