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In this week's experiment, the heat of vaporization of liquidnitrogen is determined by measuring the change in temperature of aknown sample of warm water when liquid nitrogen is added.

In one experiment, the mass of water is 104 grams,the initial temperature of the water is69.3^oC, the mass of liquid nitrogenadded to the water is 60.6 grams, and the finaltemperature of the water, after the liquid nitrogen has vaporized,is 41.3^oC.

Specific heat of water = 4.184 J K^-1g^-1

How much heat is lost by the warm water?

Heat lost =         J

What is the heat of vaporization of nitrogen in Jg^-1?

Heat of vaporization=           Jg^-1

What is the molar heat of vaporization of nitrogen?

Molar heat of vaporization=            J mol^-1

Trouton's constant is the ratio of the enthalpy (heat) ofvaporization of a substance to its boiling point (in K). Theconstant is actually equal to the entropy change for thevaporization process and is most often a measure of the entropy inthe liquid state. The value of the constant usually lies within therange 70 to 90 J K^-1mol^-1, with a valuetoward the lower end indicating high entropy in the liquidstate.

The normal boiling point of liquid nitrogen is -196^oC.Based upon your results above, what is the value of Trouton'sconstant?

Trouton's constant=           JK^-1mol^-1