Q1: Methane is mixed with stoichiometric proportion of oxygen and completely combusted. The number of additional specifications required to determine the product flow rate and composition is

ANS:C - 2

To determine the product flow rate and composition after the complete combustion of methane (𝐶𝐻4CH4​) mixed with a stoichiometric proportion of oxygen (𝑂2O2​), we need to consider the stoichiometry of the reaction. The balanced chemical equation for the complete combustion of methane is: 𝐶𝐻4+2𝑂2→𝐶𝑂2+2𝐻2𝑂CH4​+2O2​→CO2​+2H2​O From the balanced equation, we can see that for every mole of methane, we need two moles of oxygen for complete combustion, producing one mole of carbon dioxide and two moles of water. Therefore, if the stoichiometric proportion of oxygen is mixed with methane, we know that the number of moles of oxygen is twice the number of moles of methane. However, to determine the product flow rate and composition, we would additionally need to know the initial flow rate or amount of methane introduced into the system. This is the additional specification required. So, the correct answer is 1.