Answer: the boiling point elevation constant is 
Explanation:
Elevation in boiling point is given by:

 = Elevation in boling point
 = Elevation in boling point
i= vant hoff factor = 1 (for non electrolyte)
 =boiling point constant = ?
 =boiling point constant = ?
m= molality

Weight of solvent (diethylether)= 330 g = 0.33 kg 
Molar mass of solute (benzophenone)= 182 g/mol
Mass of solute (benzophenone) = 38.2 g


Thus the boiling point elevation constant is 
 
        
             
        
        
        
Answer:
E) 2.38
Explanation:
The pH of any solution , helps to determine the acidic strength of the solution , 
i.e. , 
- Lower the value of pH , higher is its acidic strength 
and , 
- Higher the value of pH , lower is its acidic strength . 
pH is given as the negative log of the concentration of H⁺ ions , 
hence , 
pH = - log H⁺ 
From the question , 
the concentration of the solution is 0.0042 M , and being it a strong acid , dissociates completely to its respective ions , 
Therefore , the concentration of H⁺ = 0.0042 M .
Hence , using the above equation , the value of pH can be calculated as follows -
pH = - log H⁺ 
pH = - log ( 0.0042 M ) 
pH =  2.38 .
 
        
             
        
        
        
The same
Explanation:
If a liquid substance is transferred to a different container, the volume of the liquid in the new container will remain the same. 
The volumes of liquids are fixed and does not change. Wherever they are contained, just like solids, they maintain their constant space. 
- Volume is the amount of space occupied by a body. 
- Gases do not have fixed volume as they fill their containers and they take up the shape. 
- Solids and liquids have a fixed volume. 
- They do not change their volume. 
learn more: 
State of matter brainly.com/question/10972073
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Answer:

Explanation:
Hello,
In this case, for latent heat (phase change) we need to consider the enthalpy associated with the involved process, here, melting or fusion; thus, the enthalpy of fusion of copper is 13.2 kJ/mol, therefore, the heat is computed as:

Nevertheless, since the given enthalpy is per mole of copper, we need to use its atomic mass to perform the correct calculation as follows:

Which is positive as it needs to be supplied to the system.
Best regards.