Brass rod is in contact thermally with a heat reservoir at 140 degrees C at one end and a heat reservoir at 50.1 degrees C at the other end. Compute the total change in the entropy (in calories/Kelvin) arising from the process of conducting 1,879 cal of heat through the rod.

The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н,о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.

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Draw two cyclic constitutional isomers of cis-1