Answer:
A. -205.7 kJ
Step-by-step explanation:
The overall enthalpy of reaction be calculated when the intermediate steps are present
formed in a multi-step process.
 
        
             
        
        
        
In order to solve by elimination, let's multiply the first equation by -2. This way, when we add the equations, the variable y will be canceled out:

Now, adding the equations, we have:

Now, calculating the value of y, we have:

Therefore the solution is (3, 0).
 
        
             
        
        
        
Answer: 120
Step-by-step explanation:
The median of a given set for numbers will be gotten when we arrange the numbers that are given in either ascending or descending order and then get the number in the middle.
Therefore, since we are given 90,100,120,120,140, it means that we have 5 numbers and the 3rd number will be the median distance. Thus will be: = 120
 
        
             
        
        
        
Answer:
this app is freakin broken you agree
 
        
             
        
        
        
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