Use Enthalpy/ composition diagram of Sulphuric acid/ water system to answer the following questions. For sections (i) to (iii), show working on the diagram, and attach the diagram to the script. (Mol wt of water =18.015,Mol wt of acid=98.078) (i) Three moles of water and one mole of sulphuric acid are mixed isothermally at 0C. How much heat must be absorbed or released to keep the mixture at 0C ? [6 marks] (ii) Three moles of water and one mole of sulphuric acid each at 0C are mixed adiabatically. Estimate the final state and temperature of the mixture. [2 marks] (iii) Three moles of water and one mole of sulphuric acid each at 21.2C are mixed adiabatically. Estimate the final state and temperature of the mixture. [2 marks] (iv) With the help of the diagram explain why it is advisable to add sulphuric acid-to-water instead of adding water-to-sulphuric acid during an adiabatic mixing. [2 marks]