Show work please A.) Consider the oxidation of NO to NO2: NO(g)+12O2(g)NO2(g) St

ID: 973570 • Letter: S

Question

Show work please

A.) Consider the oxidation of NO to NO2:

NO(g)+12O2(g)NO2(g)

Standard thermodynamic quantities for selected substances at 25C

Calculate Grxn at 70 C.

Express the free energy change to three significant figures and include the appropriate units.

B.)Calculate the G°rxn using the following information.

G°rxn = ?

C.)What is the equilibrium constant of the reaction at 25°C if G° = -13.0 kJ?

2NO(g) + Br2(g) 2NOBr(g)

Substance Hf(kJ/mol) S(J/(molK)) NO(g) 91.3 210.8 NO2(g) 33.2 240.1 O2(g) 0 205.2

A) dG = dH - TdS

dH = dHf of products -dHf of reactants

dH = 33.2 - 91.3

dH = - 58.1 kJ/mol

dS = S of products - S of reactants

dS = 240 - { 210.8 + 1/2(205.2) }

dS = - 73.4 J/mol

dG = - 58100 J/mol - { 343 K * ( -73.4) J/mol k}

dG = 32.92 kJ/mol

B) similar calculation in A, T = 298 K

Ans b) = + 196.8 kJ

C) dG = - RT lnK

lnK = - ( -13000 ) J / 8.314 J/mol K *298 K

lnK = 5.3

K = 190.5

So Ans a) = 190

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