Hess’ law and enthalpy cycles

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6 Terms

1
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What does Hess’ law state?

If a reaction can take place by 2 routes, and the starting and finishing conditions are the same the total enthalpy change is the same for each route

2
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<p>How would you work out c?</p>

How would you work out c?

A + B = C

110 +- 150 = -40

3
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How do you construct an enthalpy cycle from ΔfH?

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4
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<p>How would you calculate A?</p>

How would you calculate A?

-B + C

5
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How do you construct an enthalpy cycle for ΔcH?

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6
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When calculating a you should start from which end of the arrow?

Opposite end (not the arrow head)