Please help with 3 and 4

"* Shows that this is a tough one! 3) Air at 100kPaabs and 25C must be compressed to 8 bar abs in a continuous process that uses a centrifugal compressor with intercooling. The outlet temperature of the air (i.e. at 5bar ) is at 340K. a) Is there any danger that water droplets at the exhaust of the compressor can form if the inlet air is 80% saturated with water? This would cause damage to the compressor blades and reduce its lifespan significantly You may use the Antoine equation given below to predict the vapour pressure of water: lnP(kPa)=AC+T(C)B,A=16.3872,B=3885.70,C=230.170 4) In experiments on an internal combustion engine, petrol (use C8H18 as an approximation for petrol), is combusted with excess air. The dewpoint of the combustion products (at Patm=. 90kPa ) is measured as 48C. Use a basis of 1kmol of petrol and estimate the amount of excess air (dry) that is fed to the engine. You may use the Antoine equation given in Tut 2.3 for vapour pressure data of water. a) Use the Antoine constants given in 3) for vapour pressure data b) Use steam tables for vapour pressure data