The reaction of A with B to give D proceeds in two steps:
(1) A + B → C ΔH° = -20 kJ
(2) C + B → D ΔH° = +50 kJ
(3) A + 2B → D ΔH° = ?
(b) What is the value of ΔH° for the overall reaction
A + 2 B → D ΔH° = ?
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