Answer:
2.28 × 10^-3 mol/L
Explanation:
The equation for the equilibrium is
CN^- + H2O ⇌ HCN + OH^-
                     Ka = 4.9 × 10^-10
                KaKb = Kw
4.9 × 10^-10 Kb = 1.00 × 10^-14
                    Kb = (1.00 × 10^-14)/(4.9 × 10^-10) = 2.05 × 10^-5
Now, we can set up an ICE table
                      CN^- + H2O ⇌ HCN + OH^-
I/(mol/L)      0.255                     0         0
C/(mol/L)       -x                        +x        +x
E/(mol/L)  0.255 - x                   x         x
Ka = x^2/(0.255 - x) = 2.05 × 10^-5
Check for negligibility
0.255/(2.05 × 10^-5) = 12 000 > 400. ∴ x ≪ 0.255
     x^2 = 0.255(2.05 × 10^-5) = 5.20 × 10^-6
         x = sqrt(5.20 × 10^-6)    = 2.28 × 10^-3
[OH^-] = x mol/L                     = 2.28 × 10^-3 mol/L
 
        
             
        
        
        
Answer:
B) Cations lose electrons having a charge of positive.
Explanation:
Hello there!
In this case, it is widely known that ions are classified as positive cations and negative anions, since the former is produced when a metal loses electrons and the latter when a nonmetal gains electrons; in such a way, the correct choice is:
B) Cations lose electrons having a charge of positive.
Best regards!
 
        
             
        
        
        
Answer:
"500 Joule/sec" is the right answer.
Explanation:
The given values are:
Force,
F = 1000 N
Velocity,
s = 10 m
Time,
t = 20 s
Now,
The power will be:
=  
On putting the values, we get
=  
=  
=  
 
        
             
        
        
        
Name	Arsenic
Atomic Mass	74.9216 atomic mass units
Number of Protons	33
Number of Neutrons	42
Number of Electrons	33