By Crompton T.R.

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10 shows the relationship of dEldT to acid concentration for the temperature range 15-40°C. f. 18 the conversion factor from international joules to calories. 7 shows heat content changes occurring at various sulphuric acid concentrations in the lead-acid battery. The A H values with 21% by weight of sulphuric acid at 15-40°C of 91 915 to 91 749 calories for the reaction Pb + PbO2 + 2H2SO4 = 2PbSO4 + 2H20 are in fair agreement with the calorimetrically determined value of 89 400 cal at the same acid concentration.

F. of the cell is given by + bB + . . -+1L + mM + . . x amM x . . + RTIn a'L a a A x abB x . . 27) where aA, aB, . . , aL, aM, . . now represent the activities of A9 €3. . , L, M, . as they occur in the reversible cell. 28) As before, A F o is the free energy change when all the substances taking part in the cell reaction are in their standard states. f. of the cell under consideration when the various substances have the arbitrary activities aA, aB, . . aL, aM. . f. , is a constant for the given cell reaction, varying only with the temperature, at 1 atmosphere pressure.

Of the cell is given by + bB + . . -+1L + mM + . . x amM x . . + RTIn a'L a a A x abB x . . 27) where aA, aB, . . , aL, aM, . . now represent the activities of A9 €3. . , L, M, . as they occur in the reversible cell. 28) As before, A F o is the free energy change when all the substances taking part in the cell reaction are in their standard states. f. of the cell under consideration when the various substances have the arbitrary activities aA, aB, . . aL, aM. . f. , is a constant for the given cell reaction, varying only with the temperature, at 1 atmosphere pressure.

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