What is e°cell for the following reaction? [ select ] 2au(s) + 3ca2+(aq) → 2au3+(aq) + 3ca(s) is the reaction spontaneous?.

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The authors use the word “backbone” in lines 3 and 39 to indicate that

17 a tourist was planning a trip by car for travelling at some constant speed for 2.5 hours. however, he found that if he increases the speed by 20 km/h he can cover the same distance in 30 minutes less time than it was planned. what was the planned speed of the tourist, in km/h?