Question

In: Chemistry

thermodynamic properties

Based on the thermodynamic properties provided for methanol (below and to the right), determine from the following list the equation(s) necessary to calculate the amount of energy needed for 22.8 kg of methanol from all gas at 65°C to —112°C.

Is this overall process endothermic or exothermic?

  • Endothermic
  • Exothermic
  • Cannot be determined from the given information.
 

Solutions

Expert Solution

For conversion of methanol gas at 65 oc to -112.oc

 

The equations would be as follows,

 

Step 1: Gas at 65 oc to liquid at 65 oc

 

Q = n (-37 kj/mol)

 

Step 2: Liquid at 65 oc to liquid at -94 oc

 

Q = n (81.1 J/mol.oc), where dt is negative

 

Step 3: Liquid at -94 oc to solid at -94 oc

 

Q = n (-3.18 kj/mol)

 

Step 4: Solid at -94 oc to solid at -112 oc

 

Q = n (48.7 J/mol.oc), where dt is negative

 

Therefore, the overall process would thus be,

 

Exothermic

 

Heat is given off to cool the entire system.

Heat is given off to cool the entire system

Raffay answered 2 years ago
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