Answer:
I think C. Hope this Helps!
Explanation:
 
        
             
        
        
        
Answer: negative , from , to , exothermic 
Explanation:
An endothermic reaction is a type of chemical reaction in which energy is absorbed from the surrounding. The temperature of the surrounding decreases.
An Exothermic reaction is a type of chemical reaction in which energy is released into the surrounding. The temperature of the surrounding increases.
Endothermic reactions are those in which heat is absorbed by the system from the surroundings and exothermic reactions are those in which heat is released by the system to the surroundings.  for Endothermic reaction is positive and
  for Endothermic reaction is positive and  
As on dissolution of salt, the temperature of water increases, the heat has been released from system into surroundings and thus  is negative.
 is negative.
 
        
             
        
        
        
Answer:
0.125 mole
Explanation:
From Avogadro's hypothesis, we discovered that 1 mole of any substance contains 6.02x10^23 atoms. 
The statement above suggests that 1 mole of chromium contains 6.02x10^23 atoms. 
Now, if 1mole of of chromium contains 6.02x10^23 atoms, 
Then Xmol of chromium contains 7.52x10^22 atoms i.e 
Xmol of chromium = 7.52x10^22/6.02x10^23 
Xmol of chromium = 0.125 mole
Therefore, 0.125 mole of chromium contains 7.52x10^22 atoms