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The triple point of ammonia is at 196.2 K and 49.42 torr. The molar enthalpy change...

The triple point of ammonia is at 196.2 K and 49.42 torr. The molar enthalpy change of vaporization is equal to 24.65 kJ mol-1 at this temperature.
a. Find the normal boiling temperature of ammonia.
b. The actual boiling temperature is -33 ̊C. Find the average value of the molar enthalpy change of vaporization for the range between the triple point and the normal boiling temperature.

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