Problem: For which of the following reactions is ΔH∘rxn equal to ΔH∘f of the product(s)? You do not need to look up any values to answer this question. Check all that apply.a) Li(s)+12F2(g)→LiF(s)b) Li(s)+12F2(l)→LiF(s)c) H2O2(g)→12O2(g)+H2O(g)d) 2H2(g)+O2(g)→2H2O(g)e) 2Li(s)+F2(g)→2LiF(s)f) H2(g)+12O2(g)→H2O(g)

FREE Expert Solution

We are being asked to determine which of the following reactions is ΔH°rxn equal to ΔH°f of the product(s)


Recall that enthalpy of reaction is given by the equation

ΔH°rxn = ΔH°f, products - ΔH°f, reactants


So for ΔH°rxn = ΔH°f, product

  • Looking for a formation equation where only 1 mole of product is made
  • Look for a reaction in which all reactants are in natural state.
    • ΔH° = reactants = 0 for elements in their natural state, such as diatomics: H2, N2, F2, O2, I2, Cl2, Br2


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Problem Details

For which of the following reactions is ΔH∘rxn equal to ΔH∘f of the product(s)? You do not need to look up any values to answer this question. Check all that apply.

a) Li(s)+12F2(g)→LiF(s)

b) Li(s)+12F2(l)→LiF(s)

c) H2O2(g)→12O2(g)+H2O(g)

d) 2H2(g)+O2(g)→2H2O(g)

e) 2Li(s)+F2(g)→2LiF(s)

f) H2(g)+12O2(g)→H2O(g)

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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.

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