When balanced, what is the sum of the coefficient in the reaction? 19 13 10 6 Th

Question

When balanced, what is the sum of the coefficient in the reaction? 19 13 10 6 The standard potential energy(E degree) for this reaction is 2.0V. what is the delta G degree for this reaction? + 193 kJ -193 kJ + 386 kJ - 386 kJ What is the cathode for this redox reaction? Pb PbO_2 PbSO_4 HSO_4 What is the standard cell potential for the spontaneous reaction? Al + 3Ag^+ rightarrow 3Ag + Al^3+ 4.06V 0.74 V 0.86V 2.46V What is the sign of delta S for this reaction? 2SO_2 (g) + O_2 (g) rightarrow 2SO_3 (g) delta S 0 Can't tell According to the 2^nd law of thermodynamics: For any spontaneous process delta H_sys > 0 For any spontaneous process delta H_sys

Explanation / Answer

15)

DeltaG = -nFEcell

=> -(1)(96500)(2)

=> -193 kJ, if the number of electron is 1 and -386 kJ if number of electron involved is 2

Hence the answer will be from b or d

17)

Ecell Ag+ ----> Ag = 0.80V

Ecell Al-----> Al(+3) = 1.66V

Erxn = Ecell(oxidation) + Ecell(reduction)

=> 1.66 + 0.80

=> 2.46V

Correct answer is Option D

18)

2SO2(g) + O2(g) ----> 2SO3(g)

change in number of moles = 2 - (2+1) = -1, which is negative, hence the entropy of system will be reduced

Therefore correct answer is Option, Delta S < 0

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