1) S + O2 = SO2
2SO2 + O2 = 2SO3
SO3 + K2O = K2SO4
K2SO4 + BaCl2 = BaSO4 + 2KCl
2) 4Rb + O2 = 2Rb2O
Rb2O + H2O = 2RbOH
RbOH + HCl = RbCl + H2O
2RbCl + H2SO4 = Rb2SO4 + 2HCl
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Answers & Comments
1) S + O2 = SO2
2SO2 + O2 = 2SO3
SO3 + K2O = K2SO4
K2SO4 + BaCl2 = BaSO4 + 2KCl
2) 4Rb + O2 = 2Rb2O
Rb2O + H2O = 2RbOH
RbOH + HCl = RbCl + H2O
2RbCl + H2SO4 = Rb2SO4 + 2HCl