ng氯酸钾和2g二氧化锰混合加热,完全反应后得到固体mg,则放出氧气的质量为请选择DCBA(E4H.S6j+N4C'V5o6s6?6F
A.(n-m)g'V5o6s6?6F
B.(m+2)g'V5o6s6?6F
C.(m-2)g'V5o6s6?6F
D.(n+2-m)g'V5o6s6?6F