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2SO2+O2→2SO3 ▲H = -198 kj
SO3 →SO2+1/2O2 ▲H = +198/2
▲H = +99 KJ
mol SO3 = 5,6 ltr/22,4 ltr/mol
= 0,25 mol
▲H penguraian SO3(g) =
0,25 x 99 kj = +24,75 kj.