Question

Part 2 Consider the combustion of ethanol in the engine cylinder of a vehicle. The process releases heat) and the resulting work (w) drives the vehicle. If the chemical reactants in the cylinder are considered the system what do you expect the signs of and w for the process? Og() O9w+) OW) Og() w Suomi Rust Answer

Answer 1

Date Page Part DJ DO 0 System surrounding Engine fig: Piston-cylinder assembly of a Engine General consideration is in i Heat released from the system is taken as i Heat absorbed by the system as taken as tve. ii) work done by the system is taken as tve iu work done on the system us taken as In this prouss , Since, heat is released q (-ve) and, the resulting work drives the vehicle work is done by the system

Date Part C) given reactions, DH = -483.64 kJ 2h (g) 2 + O₂(g) - 21h (9) OH = 571. 66 kJ 2 H₂O (e) 2H₂ (g) + O₂ (g) Add + + O2(g) 24 (g) + O2(g) + 2H0 (1) 2H₂O(g) + 2H2(g) + 2 AH = -483.64 + 571 66 88.02 ΔΗ RHS Change LHS 2 H₂O (1) - 88.02 KS 21,019) divide by 2 H₂O (9) hole AH = 88.02 2 44.01 "The enthaply for vapour the condensation of water 44.01