Question

H2+O2 = a
Ca + O2 =b
a+b=c
d+o2=e
e+a=H2SO4
e+O2 =f
f+a=g

Answer 1

H2 + 1/2 O2 => H2O
Ca + 1/2 O2 => CaO
H2O + CaO => Ca(OH)2
S + O2 => SO2
SO2 + H2O => H2SO3
SO2 + 1/2 O2 => SO3
SO3 + H2O => H2SO4

Answer 2

2H₂ + O₂ = 2H₂O [a] - apa

2Ca + O₂ = 2CaO [b] - oxid de calciu (var nestins)

CaO + H₂O = Ca(OH)₂ [c] - hidroxid de calciu (var stins)

S [d] + O₂ = SO₂ [e] - dioxid de sulf

SO₃ + H₂O = H₂SO₃ [g] - acid sulfuros

SO₂ + 1/2O₂ = SO₃ [f] - trioxid de sulf

SO₃ + H₂O = H₂SO4 [g] - acid sulfuric (vitriol)