# Answered Essay: Hess's Law of Heat Summation Imagine that we want to know the enthalpy change for the Hess’s Law of Heat Summation Imagine that we want to know the enthalpy change for the following unknown reaction: 3A + 2B → F However, the only data we have is for the following known equations: Equation 1: A + D → C Equation 2: C + B → E Equation 3: 2E + C → F + 3D ΔHa_-290 kJ a) Which of the following combinations of these equations will yield the overall equation we want? Remember that the target reaction is: 3A + 2B → F Equation 1+Equation 2 Equation 3 2*(Equation 1)+ 2*(Equation 2) Equation 3 。3″(Equation 1) + 2″(Equation 2) + Equation 3 Equation1 +2″(Equation 2) 2*(Equation 3) 2″(Equation 1)+3*(Equation 2)- Equation 3 3*(Equation 1)- Equation 2 – 2*(Equation3) b) what is the ΔHo for this overall reaction (3A + 2B → F)? kJ/mole rxn

We require

3A + 2B –> F

analysis:

We need 3A; only equation 1 has A, so we must multiply equation 1 by 3

HRxn = 3+(-222) = -666 kJ

we get

3A + 3D = 3C H = -666 kJ

also, we need 2B , so multiply equation 2 by 2

2C + 2B = 2E H = 2*(-99) = -198 kJ

Also, we need F in the right side, so add Equation 3 as it is

2E + C = F + 3D H = -290

3A + 3D = 3C H = -666 kJ

2C + 2B = 2E H = -198 kJ

2E + C = F + 3D H = -290

3A + 2B = F H = (-666 +-198 + -290) = -1154 kJ

best answer is then:

multiply equation 1 by 3; then equation 2 by 2, and equation 1 as it is

b)

HRxn =  -1154 kJ Calculate your paper price
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