bKJmolCO的精选

问题详情：已知键能数据：C-H为aKJ/mol，O2中看作O=O为bKJ/mol,C=O为mKJ/mol, H-O为nKJ/mol.则可计算CH4(g)+2O2(g)=CO2(g)+2H2O(g)  ∆H，此反应∆H是（  ） A.（+4a+2b-2m-4n）                    B.（+4a...