Question

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. View Available Hint(s) Check all that apply. CaCO3(g)→ CaO+ CO2(g) Li(s)+12F2(g)→LiF(s) CO(g)+12 O2(g)→ CO2(g) 2Li(s)+F2(g)→2LiF(s) Li(s)+12F2(l)→LiF(s) C(s,graphite)+ O2(g)→ CO2(g)

Answer 1

Answer:reaction 2,5,6

Explanation:

First, we need to define what the enthalpy of formation is and what the enthalpy of reaction is____

Formation Enthalpy: It is the variation of the calorific energy in the reaction of ONE MOL of a compound starting from the elements.

Reaction Enthalpy: It s the variation of the calorific energy in the reaction of reactives, in this cases could be any quantity of mol

Then: We have six reactions:

1)CaCO3(g)→ CaO+ CO2(g)

2)Li(s)+12F2(g)→LiF(s)

3)CO(g)+12 O2(g)→ CO2(g)

4)2Li(s)+F2(g)→2LiF(s)

5)Li(s)+12F2(l)→LiF(s)

6)C(s,graphite)+ O2(g)→ CO2(g)

The enthalpy of reaction will be equal to reaction enthalpy when we produce one mol from elements

The answer is the reactions 2,5,6