The heat of fusion of dichloromethane is . Calculate the change in entropy when of dichloromethane freezes at . Be sure your answer contains a unit symbol. Round your answer to significant digits.

This is an incomplete question, here is a complete question.

The heat of fusion of dichloromethane (CH₂Cl₂) is 6.2 kJ/mol. Calculate the change in entropy ΔS when 345. g of dichloromethane freezes at -95.1 degree C. Be sure your answer contains a unit symbol and the correct number of significant digits.

Answer : The value of change in entropy is 35 J/mol.K

Explanation :

Formula used :

where,

= change in entropy  = ?

= change in enthalpy of fusion = 6.2 kJ/mol

= fusion temperature =

Now put all the given values in the above formula, we get:

Therefore, the value of change in entropy is 35 J/mol.K

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in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm