Question

H2S+O2=S+H2O    

AL+CL2=ALCL3

  Cu+N2=Ca3N2

KBr+CL2=Br2+KCl                                                                                                                                             

Answer 1

2H2S+O2=2S+2H2O     2AL+3CL2=2ALCL3   3Ca+N2=Ca3N2 2KBr+CL2=Br2+2KCl