This is molarity: moles of solute/liters of solution. (Not molality)
1. Plug in what we know:
500 mL = 0.5 L
0.80 = moles/0.5
0.80*0.5 = moles
moles = 0.4
2. NaOH is given as 40 g/mole, so calculate the grams:
0.4 * 40 = 16 grams
answer: 16 grams
 
        
             
        
        
        
A catalyst is a substance that increases the rate of a chemical reaction without itself being consumed . (ans: second choice)
        
                    
             
        
        
        
for what????? complete the question
 
        
                    
             
        
        
        
When HCl reacts with a metal, hydrogen gas will be evolved. To test this gas, insert a burning splinter into the outlet of gas, the flame will be extinguished with a pop sound. This will confirm the gas is hydrogen.
        
             
        
        
        
I believe it would be the color Red.