someone please help with these. Please do solve both. Thanks in advance!

3. ( 25 points) Given that the reaction for fresh feed A and B is 2A+5B3C+6D in a reactor with recycle, find the desired recycle ratio (moles recycle/moles fresh feed) if in the fresh feed A is 20% in excess, the once through conversion of B is 60%, and the overall conversion of B to products from the overall process is 90%. After the products exit from the reactor, a stream of pure B is separated from the products and forms the recycle. Assume 1mol of B in the feed as a basis. 4. (25 points) In a combustion chamber methane and ethane are bumed with air. The stack gas (or flue) leaves at 300C and 105kPa. There is no CO, and no residual O2, methane or ethane in the stack gas (conversion is 100% ). The partial pressure of CO2 in the stack gas is 80mmHg. Find the mole fraction of methane in the fuel and the dew point temperature of the flue