Solid State Transformation in Ammonium Nitrate

Ammonium nitrate undergoes a phase transition from one solid modification to another at 125.5°C at 1 atm, and at 135°C at 1000 atm. The form stable at the higher temperatures has an average volume of 0.0126 cc/gram greater than the other modification over the pressure range studied. Calculate the heat of transition (in cal/mole).

Choose your answer in scientific notation, i.e., ± x.yzE{± ab}, and then press the 'Submit the above answer' button (below).

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Carl W. David
Department of Chemsitry
University of Connecticut
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