The reactants are 0.2 mol of methane (CH4) and 0.35 mol of oxygen (O2), and the reactant * * * contains 0.2 mol of C, 0.8 mol of H and 0.7 mol of O atoms.
After the reaction, the product contains 0.4 mol of water (H2O), 0. 1 mol of carbon dioxide (CO2), 0. * *1mol of carbon, 0.8 mol of hydrogen and 0.6 mol of oxygen ... After subtraction, X contains 0. 1mol of C and 0./. It can be inferred that it must contain oxygen.
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