The heat of vaporization ΔHv of dichloromethane CH2Cl2 is 28.0 /kJmol . Calculate the change in entropy ΔS when 3.3g of dichloromethane boils at 39.8°C . Be sure your answer contains a unit symbol and the correct number of significant digits.

Explanation:

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In this case, the change in the entropy, by knowing the change in the enthalpy and the temperature for a vaporization process is given by:

Thus, we start by computing the change in the enthalpy for the 3.3g of dichloromethane  as shown below:

Finally, the change in the entropy, considering the temperature in kelvins:

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