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Problem: For which one of the following reactions is the value of ΔHrxn equal to ΔHf° for the productA) 2 H2 (g) + O2 (g) → 2 H2O (g)B) C (s, graphite) + 2 H2 (g) → CH4 (g)C) Na (s) + Cl (g) → NaCl (s)

FREE Expert Solution

We are asked to determine which reactions will have equal ∆H°rxn and ∆H°f


• The enthalpy of formation, ∆H°f is calculated from the formation equation where one mole of product is formed from the standard or elemental forms of each element.

• ∆H°rxn will be equal to ∆H°f if the reaction is a formation equation


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Problem Details

For which one of the following reactions is the value of ΔHrxn equal to ΔHf° for the product

A) 2 H2 (g) + O2 (g)  2 H2O (g)

B) C (s, graphite) + 2 H2 (g) → CH4 (g)

C) Na (s) + Cl (g) → NaCl (s)

Frequently Asked Questions

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 Formation Equations concept. You can view video lessons to learn Formation Equations. Or if you need more Formation Equations practice, you can also practice Formation Equations practice problems.

What professor is this problem relevant for?

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