Question
Chemistry Question on Enthalpy change
17.0 g of NH3 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 NH3 under the same conditions is ____ kJ.
Answer
The correct answer is: 117
Number of moles of NH3 = 5
So, required ΔH = 5 × 23.4
= 117 kJ