Mr (K2CO3) = 39*2+12+16*3= 78+12+48= 90+48=138
Mr(ZnCl2)= 65+2*35=65+70=135
Mr(SO2)= 32+2*16= 32+32= 64
Mr (K2CO3) = 39*2+12+16*3= 78+12+48= 90+48=138
Mr(ZnCl2)= 65+2*35=65+70=135
Mr(SO2)= 32+2*16= 32+32= 64