Mr(H2SO4) = 1*2 + 32 + 16*4 = 98
Mr(NaOH) = 23 + 16 + 1 = 40
Mr(SO2) = 32 + 16*2 = 64
Mr(Cl2) = 35,5 *2 = 71
Mr(K2SO4) = 39*2 + 32 + 16*4 =174
Mr(H2SO4) = 1*2 + 32 + 16*4 = 98
Mr(NaOH) = 23 + 16 + 1 = 40
Mr(SO2) = 32 + 16*2 = 64
Mr(Cl2) = 35,5 *2 = 71
Mr(K2SO4) = 39*2 + 32 + 16*4 =174