Question #a165f
1 Answer
Dec 8, 2017
The enthalpy is
Explanation:
The answer can be found out using the Clausius Clapeyron equation:
ln(P_2/P_1) = -(DeltaH_(vap)) / R (1/T_2 - 1/T_1)
Here,
Don't forget to change temperature to absolute Kelvin (Celsius + 273 approximately).
So,
R = "8.314 J/mol"cdot"K"
ln("290 torr"/"242 torr") = -(DeltaH_(vap)) / ("8.314 J/mol"cdot"K") (1/"323 K" - 1/"373 K")
= -"3624.9 J/mol" = -"3.6 kJ/mol"
Since the enthapy is negative , the liquid could be condensing!