Решение: Mr[Fe2O3] = Ar[Fe] * 2 + Ar[O] * 3 = 55.845 * 2 + 15.9994 * 3 = 159.6882 г/моль; Mr[H2SO4] = Ar[H] * 2 + Ar + Ar[O] * 4 = 1.00794 * 2 + 32.065 + 15.9994 * 4 = 98.07848 г/моль; Mr[CuO] = Ar[Cu] + Ar[O] = 63.546 + 15.9994 = 79.5454 г/ моль; Mr[P2O5] = Ar[P] * 2 + Ar[O] * 5 = 30.973762 * 2 + 15.9994 * 5 = 141.944524 г/ моль; Mr[CS2] = Ar[C] + Ar * 2 = 12.0107 + 32.065 * 2 = 76.1407 г/ моль; Mr[HNO3] = Ar[H] + Ar[N] + Ar[O] * 3 = 1.00794 + 14.0067 + 15.9994 * 3 = 63.01284 г/ моль; Ответ: 159.6882 , 98.07848 , 79.5454 ,141.944524, 76.1407 , 63.01284 г/ моль.