Chemistry - Thermochemistry - Hess's Law - Hess's Law Problems

4 Hess's Law calculations. Q1: 'Given: A→B, ΔH=+50. B→C, ΔH=-80. Find ΔH for A→C: ___kJ' (-30). Q2: 'Given: A→B, ΔH=-100. Find ΔH for B→A: ___kJ' (+100). Q3: 'Given: (1) S + O₂ → SO₂, ΔH=-297. (2) SO₂ + ½O₂ → SO₃, ΔH=-99. Find ΔH for S + 1½O₂ → SO₃. Method: Add (1)+(2): ΔH = ___kJ' (-396). Q4: 'Give