In a burner operated in batch, 100 mol of methane is burned with 250 mol of oxygen. The combustion reaction following the stoichiometric reaction equation: The product stream is a gas mixture with the composition of: 40 mol methane 130 mol oxygen 60 mol carbon dioxide 120 mol water The system achieved steady state at the end of combustion. Determine the following: How much methane was consumed? What is the fractional conversion of methane? How much oxygen was consumed? What is the percentage of excess of oxygen?