Heats of solution + Heat of Reaction ?

[ghostanime2001]

Homework Statement

$$FeS_{(s)} + 2HCl_{(aq)} \rightarrow FeCl_{2(aq)} + H_{2}S_{(g)}$$

$$H^{\circ}_{f}$$values in kilojoules per mole:

$$HCl_{(g)} = -93$$

$$FeS_{(s)}=-95$$

$$H_{2}S_{(g)} = -20$$

$$FeCl_{2(s)} = -341$$

$$H_{sol}$$ values in kilojoules per mole:

$$HCl_{(g)} = -74$$

$$FeCl_{2(s)} = -79$$

How much heat will be evolved in making 15.2g of $$H_{2}S_{(g)}$$ at STP from $$FeS_{(s)}$$ and dilute $$HCl_{(aq)} ?$$

Homework Equations

How do I calculate the heat evolved? I know its pretty useless to calculate the heat of reaction for this entire reaction because i have heats of solution instead. So what can i do ?

 

[Borek]

Hint: Born-Haber cycle.

 

[ghostanime2001]

We arent supposed to learn that

 

[ghostanime2001]

So what can i do besides using Borne-Haber process its not even part of the curriculum

 

[Borek]

What I was aiming at was that Hess law can be used even when you need to account for things like ionization, dissolution and hydration. Knowing H_f of HCl(g) and H_sol of HCl you can calculate H_f of HCl(aq).

 

[ghostanime2001]

How ?

 

[ghostanime2001]

How does knowing Hf of HCl(g) and Hsol of HCl you can calculate Hf of HCl(aq) help me ?

 

[ghostanime2001]

Heloooooooooooooooooooooooooooooooooooooo ?

 

[ghostanime2001]

I need to convert FeCl2 and HCl into (aq) states right ? to find the enthalpy change of that