Помогите срочно!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
4Na+O2=2Na2O 2Li+H2O=2LiOH 2Mg+O2=2MgO 2Cu+Na2SO4=Cu2SO4+2Na 2Cu+S=Cu2S Mg+2HCL=MgCL2+H2