Problem 8.102 Part A Tell which reaction(s) with the following values of ? H and

ID: 809454 • Letter: P

Question

Problem 8.102

Part A

Tell which reaction(s) with the following values of ?H and ?S are spontaneous.

CHOOSE FROM THE FOLLOWING , check all that applies

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Part B

Tell which reaction(s) with the following values of ?H and ?S are exothermic.

Check all that apply.

CHOOSE FROM THE FOLLOWING , check all that applies

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?H = +48 kJ, ?S = +135 J/K at 400 K ?H = +48 kJ, ?S = -135 J/K at 400 K ?H = -48 kJ, ?S = +135 J/K at 400 K ?H = -48 kJ, ?S = -135 J/K at 400 K

Part A::

The equation you need for these problems is the one for Gibbs free energy, or delta G

delta G = delta H - T (delta S)
where T is temperature

If the Gibbs free energy is negative, the process is spontaneous. If it's positive, it's non-spontaneous.

so your answers would be

?H = +48 kJ, ?S = +135 J/K at 400 K

?H = -48 kJ, ?S = +135 J/K at 400 K

Part B::

If ?H is negative then the reaction is exothermic

So your answer would be

?H = -48 kJ, ?S = -135 J/K at 400 K ?H = -48 kJ, ?S = +135 J/K at 400 K