54 mL Ba(OH)2x(0.101 mol Ba(OH)2/1000 mL) x (2 mol OH-/ 1 mol Ba(OH)2 )  = 0.0109 mol OH-
                                   
 
0.0109 mol OH-x (1mol HCl/ 1 mol OH- ) = 0.0109 mol HCl
                                                      
 
0.109 mol HCl/(0.130 mol/L HCl) =  0.0839 L HCl 
 
0.0839 L HCl * 1000mL = 83.9 mL of 0.130 M HCl
 
        
             
        
        
        
Neon is the element that is classified as a noble gas at STP.
        
             
        
        
        
Answer:
Explanation:
a) 1 troy ounce is equal to 31.103 g
2.41 troy ounce is equal to 2.41 x 31.103 g 
= 74.958 g
b) 1  ounce = 1 / 16 lb = 1/16 x 453.6 g = 28.35 g.
1 troy ounce = 31.103 g 
so 1 troy ounce is heavier than 1 ounce.
 
        
             
        
        
        
A test tube of zinc oxide
        
                    
             
        
        
        
Answer:
Explanation:
Endothermic reactions absorb energy from the surrounding, but exothermic reactions release energy to the surrounding.