# 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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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)

What scientific concept do you need to know in order to solve this problem?

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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Our tutors rated the difficulty ofUse the standard enthalpies of formation in the table CrO42-...as medium difficulty.

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Our expert Chemistry tutor, Dasha took 2 minutes and 50 seconds to solve this problem. You can follow their steps in the video explanation above.

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Based on our data, we think this problem is relevant for Professor Ratliff's class at USF.