Thermodynamics, enthalpy

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6 Terms

1
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Why can we set w as 0 for a reaction in a container of constant volume? (For △U = w + q)

A reaction in a container of constant volume can have no expansion work done by the system therefore no other kind of work can be done

2
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How to calculate Chang win enthalpy when a reaction occurs?

△H= H(prod) - H(reac)

3
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Is vaporisation endothermic or exothermic and why?

Endothermic

Because energy has to separate the molecules of liquid

4
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Is fusion endothermic or exothermic and why?

Endothermic

Energy has to separate the molecules of solid (to melt)

5
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How to calculate sublimation?

△SubH= △fusH + △vapH

6
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What is the standard enthalpy of formation of an element in its most stable form?

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