It looks like we are solving for a pressure.  All that is required is some algebraic manipulation to find our pressure in mmHg.
Given:
(5.0 m³)(7.5 mmHg) = (P)(4.0m³)
Multiply:
37.5 = 4.0P
Divide:
9.375 = P
P = 9.4 mmHg (remember sig figs)
<h3>
Answer:</h3>
9.4 mmHg
 
        
             
        
        
        
1.78L x (3.00M/1L) = 5.34
        
             
        
        
        
Answer:
0.014mol
Explanation:
Given parameters: 
Mass of Na₂CO₃  = 1.5g 
Unknown: 
Number of moles  = ? 
Solution: 
Number of moles of a compound is mathematically expressed as; 
   Number of moles  =  
  
  Molar mass of  Na₂CO₃  = 2(23) + 12 + 3(16) = 106g/mol 
  Number of moles =  = 0.014mol
   = 0.014mol
 
        
             
        
        
        
Answer:
Changes in Properties Changes in properties result when new substances form. For instance, gas production, formation of a precipitate, and a color change are all possible evidence that a chemical reaction has taken place. ... Change in Color A color change can signal that a new substance has formed.
Explanation:
 
        
             
        
        
        
Answer:
Explanation:
Combustion.  Have fun with that.