4{Na3[Co(NO2)6]•0.5H2O} 12NaNO2 + CoO + 4NO + 8NO2 + 2H2O
The thermal decomposition of sodium hexanitrocobaltate(III) hemihydrate to produce sodium nitrite, oxide cobalt(II), nitric oxide, nitrogen dioxide and water. This reaction takes place at a temperature of 200-250°C.