Напишите уравнения реакций,с помощью которых можно получить железо из карбоната железа(II). пожалуйста

5\7(0,21-1,4х)-4\9(0,36-4,5х)

Дано:V1=70, V2=90 , S=220км ,Найти : t-?

Task 1. Write the correct preposition in each gap. The CND. The Campain (a) for Nuclear Disarmament (CND) is celebrating thirty years of calling The Campain (a) ... Nuclear Disarmament (CND) is celebrating thirty years (b)... the removal © ... Britain’s nuclear weapons. CND believes (d) ... unilateral disarmament. The chairman of the organization, Bruce Kent, says’ Ideas (e) ... disarmament have changed (f) ... the years. Russian & American leaders now agree that an equal number of weapons (g) ... both sides is not necessary (h) ... security, & the major cuts (i) ... nuclear arms should be made. These ideas stemmed (j) ... groups like CND, who have argued (k) ... reductions for years. CND was launched in London in 1958 (l) ... a meeting (m) ... five thousand enthusiasts. (n) ... that time, Britain had just begun to test its own H-bomb, & the policy (o) ... having its own nuclear weapons to stop other countries (p) ... attacking had been made official. By 1961 there were nearly one thousand CND groups in Britain protecting (q) ... increased expenditure ® ... nuclear arms. But since then, there had been a decline (s) ... member ship. Bruce Kent explains, We failed (t)... our attempt to make people see the connection (u) declining social services & the fact that the goverment is spending twelve billion pounds (v) ... Trident missiles. 

атомы являют структурной частицей в кристаллической решётке 1.бензола 2.кварца 3.воды 4.азота