Chemistry, 25.02.2020 23:09 SoyAmbia

PART A: Use the following glycolytic reaction to answer the question. If the concentration of DHAP is 0.125 M and the concentration of G3P is 0.06 M in a cell, what is the free energy change (ΔG)? Give your answer in 3 significant figures. (NOTE: Units are asked for in Part B.)

DHAP -> G3P (reversible)

Keq=5.4e-2
PART B: Units are important for all mathematical calculations. What are the units for free energy change in Part A?
PART C: Select ALL answers that correctly complete this sentence. Based on the calculated free energy change in Part A, the

a) forward reaction is favorable
b)forward reaction is unfavorable
c) reverse reaction is favorable
d) reverse reaction is unfavorable.

Answers: 2

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Answers

Answer from: ushayuri

For A: The free energy change of the reaction is -5339.76 J/mol

For B: The units of free energy change of the reaction are kJ/mol

For C: The forward reaction is favorable and reverse reaction is unfavorable.

Explanation:

For the given chemical reaction:

$DHAP\rightleftharpoons G_3P$

For A:

Relation between standard Gibbs free energy and equilibrium constant follows:

$\Delta G^o=-RT\ln K_{eq}$

To calculate the free energy change, we use the equation:

$\Delta G=\Delta G^o+RT\ln Q$

Or,

$\Delta G=-RT^o\ln K_{eq}+RT\ln Q$

where,

$\Delta G$ = Free energy change

R = Gas constant = 8.314J/K mol

T^o = standard temperature = 25^oC=[273+25]K=298K

T = temperature of the cell = 37^oC=[273+37]K=310K

K_[eq} = equilibrium constant = $5.4\times 10^{-2}$

Q = reaction coefficient = $\frac{[G_3P]}{[DHAP]}$

[G_3P] = 0.06 M

[DHAP] = 0.125 M

Putting values in above equation, we get:

$\Delta G=[-(8.314J/mol.K\times 298K\times \ln (5.4\times 10^{-2}))]+[(8.314J/mol.K\times 310K\times \ln (\frac{0.06}{0.125}))]\\\\\Delta G=-[-7231.46]+[-1891.7]=-5339.76J/mol$

Hence, the free energy change of the reaction is -5339.76 J/mol

For B:

Converting the free energy change of the reaction into kilojoules, we use the conversion factor:

1 kJ = 1000 J

So, $-5339.76J/mol\times \frac{1kJ}{1000J}=-5.34kJ/mol$

Hence, the units of free energy change of the reaction are kJ/mol

For C:

For the reaction to be spontaneous, the Gibbs free energy of the reaction must come out to be negative. But, from the above calculation, the Gibbs free energy of the reaction is positive. Thus, the reaction is non-spontaneous.

As, the free energy change of the reaction is negative.

Hence, the forward reaction is favorable and reverse reaction is unfavorable.

Answer from: Quest

iron and sleel

make siroeel

Answer from: Quest

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

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PART A: Use the following glycolytic reaction to answer the question. If the concentration of DHAP i...

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