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Verified answer
A.n HBr = 72/81 = 0,89 mol
delta H = 1/0,89 x -72,8 = -81,79 kj
1/2H2 + 1/2Br2 --->>> HBr delta H = -81,79Kj
b.
n SO2 = 11,2/22,4 = 1/2 = 0,5 mol
delta H = 1/0,5 x -148,4 = -296.8 kj
SO2 -->>> S + O2 delta H = -296,8 kj