Find the change in enthalpy when 500 grams of the compound are heated at atmospheric pressure from liquid at 50 °C to vapor at 150 °C.
A compound has the following properties at atmospheric pressure:
• Normal boiling point of 95 °C
• Specific enthalpy of vaporization of 900 J/g
• In the liquid phase, CP = 2.4 J/gK
• In the vapor phase, CP = 3.0 J/gK
1 = liquid at 50 °C and 1 atm
2 = saturated liquid at 95 °C and 1 atm
3 = saturated vapor at 95 °C and 1 atm
4 = vapor at 150 °C and 1 atm
Enthalpy is a state property, so:
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