Chemistry Practice Problems Enthalpy of Formation Practice Problems Solution: Use the standard enthalpies of formation in the ta...

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Solution: Use the standard enthalpies of formation in the table  CrO42- (aq) = -881.2 Cr2O72-(aq) = -1490.3 H+ (aq) = 0 H2O (l) = -285.8 to calculate ΔH for this reaction: 2CrO42- (aq) + 2H+(aq) → Cr2O72-(aq) + H2O (l)

Problem

Use the standard enthalpies of formation in the table 

CrO42- (aq) = -881.2

Cr2O72-(aq) = -1490.3

H+ (aq) = 0

H2O (l) = -285.8

to calculate ΔH for this reaction:

2CrO42- (aq) + 2H+(aq) → Cr2O72-(aq) + H2O (l)