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Posted by on Saturday, April 21, 2012 at 12:03pm.

A reaction will be nonspontaneous under all conditions when

a. delta G is negative
b. delta H is negative and DS is positive
c. delta H is positive and DS is negative
d. delta H is positive independent of the value and sign of DS
e. delta S is positive independent of the value and sign of DH

?

  • chemistry - , Saturday, April 21, 2012 at 3:40pm

    dG = dH - TdS.
    Go through each answer and see if it fits; for example, #1 can't be right because when dG is - the reaction is spontaneous.
    #2.
    If dH is - and dS is +, then the term TdS is - so dG is always - when this is true and the rxn is spontaneous. So scratch 2.
    Etc.

  • chemistry - , Saturday, April 21, 2012 at 6:15pm

    e?

  • chemistry - , Saturday, April 21, 2012 at 7:26pm

    e is not it.
    dG = dH - TdS.
    If dS is + then the term -TdS will be negative but some dH values (even though they are + values) still can give a - dG value and the reaction will be spontaneous.

  • chemistry - , Sunday, April 22, 2012 at 12:59pm

    so d then

  • chemistry - , Sunday, April 22, 2012 at 2:04pm

    no. c

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