A.(3m+n) mol                                  B.(m+ -3p ) mol

C.(3m+n+2p) mol                            D.( m+) mol

m mol C₂H₂跟n mol H₂在密闭容器内反应，当达到平衡时，生成p mol C₂H₄。将平衡混合气体完全燃烧生成CO₂和H₂O，所需氧气的物质的量是

A.(3m+n) mol                                    B.() mol

C.(3m+n+2p) mol                              D.() mol

A.(3m+n) mol                                       B.(-3p ) mol

C.(3m+n+2p) mol                                D.() mol