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17.0 mathrm{~g} ext { of } mathrm{NH}_{3} completely vapourises  ext { at }-33.42^{circ} mathrm{C} and 1 bar pressure and the enthalpy change in the process is 23.4 mathrm{~kJ} mathrm{~mol}^{-1} ext {. } The enthalpy change for the vapourisation of 85 mathrm{~g} ext { of } mathrm{NH}_{3} under the same conditions is _________kJ.

Option: 1

117


Option: 2

-


Option: 3

-


Option: 4

-


Answers (1)

best_answer

Given,

\mathrm{1\: mole \: \mathrm{NH}_{3}\: requires \: 23.4 \mathrm{~kJ} \mathrm{~mol}^{-1}}

\therefore \mathrm{5\: mole \: \mathrm{NH}_{3}\: under\: identical \: conditions\: require\: 23.4 \times 5 \mathrm{~kJ}}=117 \mathrm{~kJ}

Hence answer is 117

Posted by

Pankaj

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