Recall that the equation for **ΔH****°**** _{rxn}** is:

$\overline{){\mathbf{\u2206}}{{\mathbf{H}}}_{\mathbf{r}\mathbf{x}\mathbf{n}}{\mathbf{=}}\left(\mathbf{p}\mathbf{r}\mathbf{o}\mathbf{d}\mathbf{u}\mathbf{c}\mathbf{t}\mathbf{s}\right){\mathbf{-}}\left(\mathbf{r}\mathbf{e}\mathbf{a}\mathbf{c}\mathbf{t}\mathbf{a}\mathbf{n}\mathbf{t}\mathbf{s}\right)}$

*Where:*

*(products) = sum of ΔH°*_{f}* of products*

*(reactants) = sum of ΔH°*_{f}* of reactants*

For this problem, we are asked the **find the reaction** where **ΔH°**_{rxn }is equal to** ****ΔH°**_{f }**of the product(s).**

For which of the following reactions is ΔH°_{rxn} equal to ΔH°_{f} of the product(s)?

2Na(s) + Cl_{2}(g) → 2NaCl(s)

H_{2}(g) + 12O_{2}(g) → H_{2}O(g)

Na(s) + 12Cl_{2}(g) → NaCl(s)

H_{2}O_{2}(g) → 12O_{2}(g) + H_{2}O(g)

2H_{2}(g) + O_{2}(g) → 2H_{2}O(g)

Na(s) + 12Cl_{2}(l) → 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 Khajo's class at CCNY.