Make any changes needed in each of the following equationsto make ΔH°ᵣₓₙ equal to ΔH°f for the compound present:(a)ΔCl(g)+Na(s)→NaCl(s) ,(b)H₂O(g)→2H(g)+1/2O₂(g) ,(c)1/2N₂(g)+3/2H₂(g)→NH₃(g)
Make any changes needed in each of the following equationsto make ΔH°ᵣₓₙ equal to ΔH°f for the compound present:(a)ΔCl(g)+Na(s)→NaCl(s) ,(b)H₂O(g)→2H(g)+1/2O₂(g) ,(c)1/2N₂(g)+3/2H₂(g)→NH₃(g)
∆H˚f is the change in enthalpy (∆H) when 1 mole of the compound is formed from its constituent elements with all the substances at the standard states.
∆Hrxn is the change in the ∆H˚f of products and reactants.
a) The given reaction is:
Thus to make ∆Hrxn of NaCl equal to the ∆H˚f (NaCl), Cl should be in the standard state.
Thus the reaction should be:
∆Hrxn of NaCl is:
b) The given reaction is:
Thus to make ∆Hrxn of H2O equal to the ∆Hf (H2O), elements and compounds should be in the standard state.
Thus the equation should be:
∆Hrxn of H2O(l) is:
In case ∆Hrxn of H2O (g) is needed, then vaporization energy will be needed to convert liquid into gas.
Step by step
Solved in 3 steps with 9 images
