(a) and (c) are right, (b) is wrong. Please solve (b)

Data: During a discharge, AG : 394 kJ and AH : 316 kJ per mole of Pb. Once again, assume that 20 kJ per mole of Pb is wasted as heat, and that this is the same whether charging or discharging the cell. Continuing with the previous two questions: (a) Compute the efficiency of this cell, defined as the ratio of eletrical work obtained during discharge to the electrical work required to charge the cell. 0.9033 (b) How much does the entropy of the cell change during single charge/discharge cycle involving 1 mole of lead? Assume the cell starts at and returns to ambient temperature, which is 298K. -53.6 UK (c) How much does the entropy of the universe change fora single charge/discharge cycle involving '1 mole of lead. Assume the cell starts at and returns to ambient temperature, which is 298K. 134.228 J/K Give all answers to 2% accuracy