An earthquake's magnitude is a measure of how much energy an earthquake releases. Typically, the richter scale is used.
        
                    
             
        
        
        
Answer:
put a salt into the beakers
 
        
                    
             
        
        
        
Answer:
0.136g
Explanation:
A student dissolved 5.00 g of Co(NO3)2 in enough water to make 100. mL of stock solution. He took 4.00 mL of the stock solution and then diluted it with water to give 275. mL of a final solution. How many grams of NO3- ion are there in the final solution?

Initial mole of Co(NO3)2  

Mole of Co(NO3)2 in final solution

Mole of  NO3- in final solution = 2 x Mole of Co(NO3)2

Mass of  NO3- in final solution is mole x Molar mass of NO3

 
        
             
        
        
        
32.6 grams divided by the molar mass of C2H6, which is 18.0584g/mol = 1.8 moles of C2H6.
As there are two carbon atoms per C2H6, we must multiply the number of moles of C2H6 by 2 to get the number of moles of Carbon which is 3.6 moles.
The answer is 3.6 moles.
Hope this helps.
(Sorry for previously incorrect answer)