I only need part 3, thank you

Butane (C4H10) burns completely with 230% of theoretical air entering at 74F, 1 atm, 50% relative humidity. The dry air component can be modeled as 21% O2 and 79% N2 on a molar basis. The combustion products leave at 1 atm. Step 1 Your answer is correct. For complete combustion of butane(C4H10) with the theoretical amount of air, what is the number of moles of oxygen (O2) per mole of fuel? 6.5 Step 2 Your answer is correct. Determine the mole fraction of water in the products, in lbmol(water)/Ibmol(products). yy = 0.08063 Hint Attempts: 1 of 3 used Step 3 X Your answer is incorrect. Determine the dew point temperature of the products, in F. Tdp = i 89.53 F