Массасы 11,7 г натрий хлориді концентрлі күкірт қышқылымен әрекеттескенде түзілетін хлорсутектің массасын есептеңдер.Өнімнің практикалық шығымы 90%-ға тең... жауабы :6,6
Шығарылу жолы керек

K2MnО4+HCl(конц)⇒МnCl2+KCl+Cl2+H2O
1) записали уравнение и расставляем степень окисл. ( Степень.окисл будит  скобочках, и степ окисл пигшим на верху каждого элемента)
К2(+1)Mn(+6)O4(-2)+H(+1)Cl(-1) (конц)
   ⇒Mn(+2)Cl2(-1)+К(+1)Сl(-1)+Cl2(0)+Н2(+1)О(-2)
На заметку; у Н(водорода) всегда +1, а у О(кислорода) всегда -2. А когда элемент один то есть как здесь Cl2 -то у него нулевая степень.  
2) Электрон.баланс
Mn(+6) + 4e⇒Mn(+2) -окислитель.
Сl(-1)+1e⇒Cl(0)-восстановитель.  
3) Теперь расставляем коэффициенты.
К2MnO4+8HCl(конц)⇒MnCl2+2HCl+2KCl=2Cl2+4H2O 
. Те цифры какие в скобка их ставить на вверху элемента))Удачи!! 

1. I played football yesterday. --> I have played football recently. --> I was playing football yesterday all day long. 2. I worked with my mother at home yesterday. --> I have already worked with my mum. --> I was working with my mom yesterday. 3. I went to the cinema last week. --> I have gone to the cinema recently. --> While I was going to the cinema, my friend broke his leg. 4. I didn't do my homework. --> I haven't done my homework yet. --> I wasn't doing my homework all day long. 5. I made an apple pie one month ago. --> I have already made an apple pie. --> I was making an apple pie when you came home.