Fe+H2O+O2->Fe(OH)3 как решить???

какой массой карбоната кальция можно заменить карбонат магния необходимый для реакций с 7,3% раствора соляной кислоты объемом 194,2мл. плотностью-1,03г/мл

Определите источник питания реки Ганг

Заполните пропуски артиклями,где это необходимо..

1.Do you want to go ... country? my wife asked me on Sunday.

2.I'd love to, I answered. We decided to go to ... Kuskovo and got there at eleven in ... morning ... weather was fine and we had ... long walk in ... park .

3.We went back to ... town at four in ... afternoon. 

4.We had ... dinner, and in ... evening we went to ... theatre.

5. ... play was very interesting and we liked it very much.

6.Then we went ... home.

7.At ... home we had ... supper, played ... game of ... chess and went to ... bed at 12 o'clock.

712 выписать предложные словосочетания.Провести морфологический разбор производных предлогов