chem quiz 4

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Last updated 8:13 PM on 4/28/26
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4 Terms

1
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What are the 4 ways to calculate enthelpy?

  • Calorimeter

  • Hess's law

  • Heats of formation

  • Bond energy

2
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What is heSs's law?

  • you're given multiple equations that need to add up to the overall equation

  • Manipulate the supplemental equations and supplemental enthalpies when needed

  • Add up new enthalpies to get the overall enthalpy

<ul><li><p>you're given multiple equations that need to add up to the overall equation</p></li><li><p>Manipulate the supplemental equations and supplemental enthalpies when needed</p></li><li><p>Add up new enthalpies to get the overall enthalpy</p></li></ul><p></p>
3
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What is enthalpy (heat of formation)?

  • The energy associated with the formation of one mole of a compound from its elements at standard state (1 ATM and 298K)

  • Delta H* rxn = (sum of delta H products) - (sum of delta H reactants)

<ul><li><p>The energy associated with the formation of one mole of a compound from its elements at standard state (1 ATM and 298K)</p></li><li><p>Delta H* rxn = (sum of delta H products) - (sum of delta H reactants)</p></li></ul><p></p>
4
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What is the first law of thermodynamics?

  • Work done on system means W > 0

  • Work done by system means W < 0

  • Change in u (internal system energy)= (delta H) - (change in n gas)RT

  • Where change in n gas = (sum of product coefficients) - (sum of reactant coefficients)

<ul><li><p>Work done on system means W &gt; 0</p></li><li><p>Work done by system means W &lt; 0</p></li><li><p>Change in u (internal system energy)= (delta H) - (change in n gas)RT</p></li><li><p>Where change in n gas = (sum of product coefficients) - (sum of reactant coefficients)</p></li></ul><p></p>