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# Free Energy & Chemical Reactions (College)

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## Free Energy & Chemical Reactions

1.
Which of the following correctly defines ∆Gº?
1. Change in free energy in converting reactants to products
2. Change in free energy in converting reactants in the standard state to products in the standard state
3. Change in energy in converting reactants to products
4. None of the above
2.
Which of the following represents a disadvantage of ∆Gº?
1. ∆Gº can never be measured
2. ∆Gº can only be measured when ∆Hº=0
3. ∆Gº can only be measured when ∆Hº<0
4. ∆Gº cannot be measured directly
3.
Which of the following represents changes in directionality, when ∆Gº decreases?
1. The reaction shifts to the left
2. The reaction does not change
3. The reaction's directionality depends on the actual value of ∆Gº
4. The reaction slowly shifts to the right
4.
Which of the following correctly represents when the equilibrium point occurs?
1. When the value of ∆Gº=1, only
2. When the value of ∆Gº<0, only
3. When the value of ∆Gº>0, only
4. At the lowest value of free energy available to the system
5.
Which of the following represents ∆Gº, in terms of temperature?
1. $∆Gº=∆Hº+T∆Sº$
2. $∆Gº=∆Hº-T∆Sº$
3. $∆Gº=∆Hº-T/{∆Sº}$
4. $∆Gº=-∆Hº-T∆Sº$
6.
Which of the following is the value of $∆Gº_f$ of an element in its standard state?
1. $∆Gº_f$<0
2. $∆Gº_f$>0
3. $∆Gº_f$=1
4. $∆Gº_f$=0
7.
Which of the following can be used to calculate entropy changes in reactions?
1. $∆Gº_{reaction}=∑n_{r}∆Gº_f{"reactants"}-∑n_{p}∆Gº_f{"products"}$
2. $∆Gº_{reaction}=∑n_{r}∆Gº_f{"reactants"}+∑n_{p}∆Gº_f{"products"}$
3. $∆Gº_{reaction}=∑n_{p}∆Gº_f{"products"}-∑n_{r}∆Gº_f{"reactants"}$
4. None of the above
8.
Which of the following represents the standard free energy of formation?
1. Change in free energy present at 1 atm
2. Change in free energy that accompanies the formation of 1 mole from constituent elements
3. Change in free energy present at 273 K
4. Both (a) and (c)
9.
Calculate the rate of formation for carbon dioxide gas, $CO_2(g)$, from carbon and oxygen, given the following ∆Gº values:

$C(s) + 0.5O_2(g) rarr CO(g) ∆Gº=-137.2 "kJ"/"mol"$
$CO_2(g) rarr CO(g) + 0.5O_2(g) ∆Gº=+257.2 "kJ"/"mol"$

10.
Calculate the $∆Gº$ for the conversion of diamond to graphite, given the following values:
$C_"diamond" (s) + O_2 (g) rarr CO_2 (g) ∆Gº="-397 kJ"$
$C_"graphite" (s) + O_2 (g) rarr CO_2 (g) ∆Gº="-394 kJ"$

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