. Given these reactions:
Question Description
. Given these reactions:
A r 2B ∆H = 40 kJ
B r C ∆H = -50 kJ
2C r D ∆H = -20 kJ
Calculate ∆H for the reaction; D + A r 4C.
(A) –100 kJ (B) –60 kJ
(C) –40 kJ (D) 100 kJ
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