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

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Problem Details

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)

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Our tutors have indicated that to solve this problem you will need to apply the Enthalpy of Formation concept. You can view video lessons to learn Enthalpy of Formation. Or if you need more Enthalpy of Formation practice, you can also practice Enthalpy of Formation practice problems.

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