Fe－feso4－fe(oh)2－fe(oh)3－fecl3－kfe[ fe(cn)6]

fe+h2so4=feso4+h2

feso4+2koh=fe(oh)2+k2so4

4fe(oh)2+o2+2h2o=4fe(oh)3

fe(oh)3+3hcl=fecl3+3h2o

fecl3+k4[fe(cn)6]=kfe[fe(cn)6]+3kcl

2ch3ch2cooh + 2na = 2ch3ch2coona + h2

2ch3ch2cooh + ba(oh)2 = (ch3ch2coo)2ba + 2h2o

2ch3ch2cooh + li2o = 2ch3ch2cooli + h2o

2ch3ch2cooh + na2s = 2ch3ch2coona + h2s

ch3ch2cooh + c2h5oh =  ch3ch2cooc2h5 + h2o

2na+2h2o=2naoh+h2

n(h2)=v/vm=44.8/22.4=2моль

n(na)=2*2=4моль

m(na)=4*23=92г