Use the data given here to calculate the values of delta Grxn at 25 C for the re

ID: 839707 • Letter: U

Question

Use the data given here to calculate the values of delta Grxn at 25 C for the reaction described by the equation:

A + B ------------> C

<--------------

Delta Gf

A +387.7

B -524.1

C 402.0

1. Delta Grxn = ? kj

2. Delta Hrxn and Delta Srxn are both positive values what drives the spontaneous reaction and in what direction at standard conditions?

The spontaneous reaction is:

a. entropy driven to the right

b. entropy driven to the left

c, enthalpy driven to the right

d. enthalpy driven to the left

(1) A + B <=> C

Delta Grxn = Delta Gf(products) - Delta Gf(reactants)

= Delta Gf(C) - Delta Gf(A) - Delta Gf(B)

= 402.0 - 387.7 - (-524.1)

= 538.4 kJ

(2) Since Delta Grxn is positive => reverse reaction is spontaneous

Delta Hrxn(reverse) = -Delta Hrxn is negative

Delta Srxn(reverse) = -Delta Srxn is negative

=> Delta H drives the spontaneous reverse reaction

(since negative Delta H is favored but negative Delta S is not)

=> d. enthalpy driven to the left

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