It is 86.35 °C. You can use the Omnicalculator Vapor pressure calculator or the Clausius Claperyron equation as follows:
Define your first point. For example, water boils at 100 °C when pressure is 1 atm.
Obtain the water enthalpy of vaporization: 40 660 J/mol. Also, remember we are going to use the gas constant: 8.3145 J/mol·K
Resolve the vapor pressure equation considering the 2nd point pressure is 0.6 atm. You will get the resulting temperature: 86.35 °C.
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