H2+F2---> Na+I2---> KI+Br2---> NaBr+AgNO3---> HI+NaCl---> H2+Cl2---> Ca+Br2---> AlBr3+Cl2---> KI+AgNO3---> HCl+KBr---> решение с коэффициентном
H2 + F2 = 2HF 2Na + I2 = 2NaI 2KI + Br2 = 2KBr + I2 NaBr + AgNO3 = NaNO3 + AgBr HI + NaCl = NaI + HCl H2 + Cl2 = 2HCl Ca + Br2 = CaBr2 2AlBr3 + 3Cl2 = 2AlCl3 + 3Br2 KI + AgNO3 = KNO3 + AgI HCl + KBr = KCl + HBr