question_answer 1)

  The enthalpy of vaporisation of \[CC{{l}_{4}}\] is \[30.5kJ\,mo{{l}^{-1}}\]. Calculate the heat required for the vaporisation of 284 g of\[CC{{l}_{4}}\] at constant pressure. (Molar mass of\[CC{{l}_{4}}=154\text{ }g\,mo{{l}^{-1}}\])

Answer:

  Heat required in vaporisation of 1 mol or 154 g \[CC{{l}_{4}}=30.5kJ\] \[\therefore \] Heat required to vaporise \[284g\,CC{{l}_{4}}=\frac{30.5}{154}\times 284\] \[=56.2\,kJ\]