Question
20,21,22,23
please explain how you came to your answer
20, Consider the following two h suitably connected? Air.laq) + 3e--. Au(s> C+04V D E"-+1.50 v 020V A. 2.57 V 21. Some of the more active mesals orode in air less rapidly than espectcd hecause B.020V E +1.75 v A. they cannot react with O B, they need to be activased by an outside apent C. they form a tightly adhering aside coat on the suutace of the metal D. they react with N2 to form a protective nitride layer. E. all of the above 22. Which statement is TRUE in regard to a sponmancous redox reaction B. E for the cell is always positive D. E for the reductiom is always positive. A. E for the reduction is always negative. C. E, for the oxidation is always positive E. E for the cell is always negative 23. Given the following two balf reactions caraq) + 2e- Cdis) E,--0.40 V determine E and the spontaneity of the following reaction A. +1.13 V and not spontancous C. -1.13 v and not sponmaneous E. not enough information given B. +1.13 V and spentancous D. -1.13 V and speetaneous
Explanation / Answer
20.
E°cell = Ered - Eox
Ered --> reduction, it ains electrons, that is the highest potential
Eox --> oxidation, loses electrons, that is the lowest potential
then
E°cell = 1.5-1.0652
E°cell = 0.4348 V
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