1. Tardigrade
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  3. Chemistry
  4. 17.0 g of NH 3 completely vapourises at -33.42° C and 1 bar pressure and the enthalpy change in the process is 23.4 kJ mol -1. The enthalpy change for the vapourisation of 85 g of NH 3 under the same conditions is kJ.

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

JEE MainJEE Main 2022Thermodynamics

Solution:

Given data is for 1 moles and asked for 5 moles so value is $23.4 \times 5=117 kJ$