n о Faculty of Engineering Second Semester Final Examination CHE 228: Engineering Chemistry (2 Units) Time: 2hrs Answer 4 Questions QUESTION 1 (17.5 Marks) (af Explain the following thermodynamic processes; Adiabatic Isochoric = Date: 28/04/2023 IV. Isobaric Isothermal (b) Hydrogen gas is expanded reversibly and adiabatically from a volume of 1.43 dm' at a pressure of 3 atm and 25°C until the volume is 2.86 dm' (Cpm-29jk-Imol-1, r -1.40). Calculate the Final temperature and pressure of the gas after expansion, the gas maybe assumed to be ideal gas qw, AE and AH QUESTION 2 (17.5 Marks) CHE (a) 1. Determine the differential and integral rate law using the equation for production of ammonia by Haber process shown below N₂+ 3H22NH, Co) + H2O(1) CO2(a) + H2(a) ii. Derive an equilibrium-constant, K from the equation obtained from 2(a) 1 (b) The homogenous irreversible reaction at 1000K, AG atmospheric for the reaction Let the feed stream contains 3 -2860j/mol and the mol Co, 1 mol H2O, 2mol CO, and 1 mol Hy. The initial constitution for the basic for the reaction then calculate the; i. Equilibrium constant, K ii. Extent of reaction, E iii. Mole fraction, y QUESTION 3 (17.5 Marks) (a) i. What is electrochemical cell? ii. Describe with the aid of a labeled diagram the mode of operation of galvanic cell (b) The emf of a cell corresponding to the reaction At 1.0 atm is 0.30V and 25°C. From the equation below i. Zn+2H(aq) → Zn (0.1m) + Hz Write the half-cell reaction and ii. Calculate the pll of the hydrogen electrode [Ell-0.76V] (c) Write the ionic balanced equation for the redox reaction between acidic KMnO, and H2C2O4- под S/XI O Wd 90:9