9. G°-95 kJ for a reaction at 25°C. Calculate the equilibrium constant, K, at 25
ID: 698485 • Letter: 9
Question
9. G°-95 kJ for a reaction at 25°C. Calculate the equilibrium constant, K, at 25°C. e) 4.5x1018 a) 1.04 b) 2.2x1038 c) 4.9×101 d) 2.2x10 10. The standard reduction potentials are Cr3+ (aq) +3e- Cr(s) Pb2+(aq) + 2e-Pb(s) End= -0.13 V Calculate AG (in kJ) for the following cell. (F 96,500 JN-mol) a) +353 kJ b)-353 kJ c)+504 kJ d) -504 kJ e) +58.9 kJ 11. Calculate the emf, E, at 25 °C for the cell given in question 10 Pb2.1-0.0010 M and the Cr1 0.10 M. a) 0.54V b)0.57 V c) 0.59 V d) 0.63V e) 0.68 V 12. Which of the following statements is not true for the following galvanic cell a) electrons move towards the copper electrode during discharge b) the mass of the tin electrode decreases during discharge c) cations from the salt bridge move into the compartment containing tin. d) the concentration of Sn2 ions increases during discharge e) tin is the anode and copper is the cathode Given the following standard reduction potentials Feayaq) + 2e Fees) Co2.faq) + 2e. Cos) Cu2+(aq) + 2e. Cus) +0.34 V 13. Which substance is the strongest reducing agent? d) Cu a) Fe b) Cuc) Co e) Fe 4. Strontium-90 is a radioactive isotope that has a half-life of 28 years. How much time is required for 85% of the isotope to decay? a) 23 years b) 77 years c) 83 years d) 94 years e) 6.6 yeans 15. ldntify the radioactive isotope that undergoes beta emission to produce Ca-43Explanation / Answer
9)
T= 25.0 oC
= (25.0+273) K
= 298 K
deltaG = -95 KJ/mol
deltaG = -95000 J/mol
we have below equation to be used:
deltaG = -R*T*ln Kc
-95000 = - 8.314*298.0* ln(Kc)
ln Kc = 38.344
Kc = 4.5*10^16
Answer: e
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