Use the standard enthalpies of formation in the table to calculate Δ H° for this reaction.
2 CrO42- (aq) + 2 H+ (aq) → Cr2O72- (aq) + H2O (l)
a) +272.1 kJ
b) +13.7 kJ
c) -13.7 kJ
d) -272.1 kJ
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