Thermochemical state functions and calorimetry

Thermochemical state functions and calorimetry - State...

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State Functions • The set of conditions that specify all of the properties of the system is called the thermodynamic state of a system. • For example the thermodynamic state could include: – The number of moles and identity of each substance. – The physical states of each substance. – The temperature of the system. – The pressure of the system. State Functions • The properties of a system that depend only on the state of the system are called state functions . A state function is the property of the system that depends only on its current state. – State functions are always written using capital letters. • The value of a state function is independent of pathway . – The value of a state function depends only on the state of the system and not on the way in which the system came to be in that state. State Functions Lets say I find and move two bricks from the sidewalk outside to the roof of the building so that the change in elevation of both bricks is exactly the same. However, lets say I don’t take the same route to get to the roof in each case. •B r i c k A Æ I carry this brick directly up the stairs to the roof. r i c k B Æ I first carry this brick over to the student lounge because I have to stop and get money from the ATM. – Then, having money, I buy a cup of coffee. – Then I wander over to my office to check my e-mail. – Finally I go back outside and take the brick to the roof of the building.
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Thermochemical state functions and calorimetry - State...

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