Consider these reactions, where M represents a generic metal.
2 M (s) + 6 HCl (aq) ⟶ 2 MCl₃ (aq) + 3 H₂ (g); ΔH₁ = − 878.0 k J
HCl (g) ⟶ HCl (aq); ΔH₂ = − 74.8 k J
H₂ (g) + Cl₂ (g) ⟶ 2 HCl (g); ΔH₃ = − 1845.0 k J
MCl₃ (s) ⟶ MCl₃ ( aq ); ΔH₄ = − 497.0 k J
Use the given information to determine the enthalpy of the reaction
2 M (s) + 3 Cl₂ (g) ⟶ 2 MCl₃ (s).

Consider these reactions, where M represents a generic metal.  Determine ΔH₅.

We need to manipulate the equations on top to output the equation on the bottom.  Hess's Law states that the total enthalpy change of the desired reaction is the sum of all ethalpy changes:

Δ.

We will need to arrange the equations so that the compounds/ elements that are not in the desired reaction will cancel out.  This can be done by reversing the reactions, and by multiplying or dividing a given equation by a factor.

For reactants in our desired reaction we have 2M (s) and 3Cl₂ (g) and their product is 2MCl₃ (s), so the compounds/ elements in the equations that will need to cancel are HCl (aq), H₂ (g), HCl (g), and MCl₃ (aq).

2. 6(HCl (g) ⟶ HCl (aq)); ΔH₂ = 6(−74.8) kJ

2. 6HCl(g) ⟶ 6HCl (aq); ΔH₂ = -448.8 kJ

3. 3(H₂ (g) + Cl₂ (g) ⟶ 2HCl (g)); ΔH₃ = 3(−1845.0) kJ

3. 3H₂ (g) + 3Cl₂ (g) ⟶ 6HCl (g); ΔH₃ = -5535.0 kJ

2. 6HCl(g) ⟶ 6HCl (aq); ΔH₂ = -448.8 kJ

3. 3H₂ (g) + 3Cl₂ (g) ⟶ 6HCl (g); ΔH₃ = -5535.0 kJ

4. 2(MCl₃ (s) ⟶ MCl₃ (aq)); ΔH₄ = 2(−497.0) kJ

4. 2MCl₃ (s) ⟶ 2MCl₃ (aq); ΔH₄ = -994.0 kJ

4. 2MCl₃ (aq) ⟶ 2MCl₃ (s); ΔH₄ = 994.0 kJ

Now when you add all the products and the reactants, the resulting equation should be 2M (s) + 3Cl₂ (g) ⟶ 2MCl₃ (s) (underlined terms cancel since they are on both sides):

2M (s) + 6HCl (aq) ⟶ 2MCl₃ (aq) + 3H₂ (g)

6HCl(g) ⟶ 6HCl (aq)

3H₂ (g) + 3Cl₂ (g) ⟶ 6HCl (g)

2MCl₃ (aq) ⟶ 2MCl₃ (s)

2M (s) + 6HCl (aq) + 6HCl(g) + 3H₂ (g) + 3Cl₂ (g) + 2MCl₃ (aq) ⟶ 2MCl₃ (aq) + 3H₂ (g) + 6HCl (aq) + 6HCl (g) + 2MCl₃ (s)

2M (s) + 3Cl₂ (g) ⟶ 2MCl₃ (s)

Finally, add the enthalpies:

−878.0 kJ + (-448.8 kJ) + (-5535.0 kJ) + 994.0 kJ = -5869 kJ

ΔH₅ = -5869 kJ

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:

we need the questions , i may then you.