setarakan persamaan reaksi Fe2O3(s)+H2(g)->Fe(s)+H2O(g)

Reaksi dikatakkan setara jika jumlah dan jenis atom-atom ruas kiri sama dg ruas kanan.
aFe2O3(s)+bH2(g)->cFe(s)+dH2O(g)
jml Fe: 2a = c
jml H: 2b = 2d
jml O = 3a = d
Jika diumpamakan a = 1, mk
2(1) = c ; c = 2
3(1) = d ; d = 3
2b = 2(3) ; b = 3
Sehingga
Fe2O3(s)+3H2(g)->2Fe(s)+3H2O(g)

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