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Q.

ΔGF0 for the formation of HI(g) from its gaseous elements is -9.67kJ/mol at 500 K. When the partial pressure of HI is 10.0 atm and of I2 is 0.001 atm. what must be the partial pressure of hydrogen at this temperature to reduce the magnitude of the reaction to zero?

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a

103 atm

b

10-3 atm

c

1 atm

d

10 atm

answer is A.

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Detailed Solution

12H2+12I2→HI,ΔGf0=-9.67 kJ/mol If ΔG=0, then Keq=Q·(Q= reaction quotient ) Now from ΔGf0=-RTlnKeq ⇒9.67=8.314×5001000lnKeq⇒Keq=10 ⇒10=PHIPH212PI212⇒PH2=100100×10-3=103 atm

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