Given that h 2 ( g ) + f 2 ( g ) ⟶ 2 hf ( g ) δ h ∘ rxn = − 546.6 kj 2 h 2 ( g ) + o 2 ( g ) ⟶ 2 h 2 o ( l ) δ h ∘ rxn = − 571.6 kj calculate the value of δ h ∘ rxn for 2 f 2 ( g ) + 2 h 2 o ( l ) ⟶ 4 hf ( g ) + o 2 ( g )

- 521.6kJ

Explanation:

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

      (1)

 (2)

The final reaction is:

    (3)

By multipling (1) by 2

     (1')

Subtracting (2) from (1')

    (3)

Hence .

The enthalpy for the reaction is -521.6kJ

kuchisake

kuchisake-onna (口裂け女, "slit mouth woman ") is a malevolent figure appearing in japanese ghost stories, possibly dating back to the edo period. she takes the form of a masked woman who approaches people and asks them if they believe she is pretty.

explanation:

a is the correct answer