# 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

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

83% (227 ratings)
###### 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)