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Identify the state function and path fun...

Identify the state function and path functions.
(a) The change in potential energy when a book is transferred from table to shelf.
(b) The heat evolved when a cube of sugar is oxidized to `CO_(2(g))` and `H_(2)O_((g))`.
(c ) The work accomplished in burning a litre of gasoline.

Text Solution

Verified by Experts

(a) Potential energy is state function.
(b) Heat is a path function because a part of it may be used in work.
(c ) Work is not a state function.
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Knowledge Check

  • The difference between heat of reaction and change in internal energy at constant volume for the reaction given below at 25^@C in kJ is 2C_6H_6(I)+15O_2(g) rarr12CO_2(g)+6H_2O(l)

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    B
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  • The standard enthalpy of formation of C_(2)H_(4)(l) , CO_(2)(g) and H_(2)O(l) are 52 , 394 and -286 kJ mol^(-1) respectively. Then the amount of heat evolved by burning 7g of C_(2)H_(4)(g) is

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    C
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    D
    `706 kJ`

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