Consider the following quantities for a reversible Carnot cycle: Step 1 q = 850 J, w = -434 J Step 2 q = 0 , w = -115 J Step 3 w = 72 J Step 4 q = 0, w = +115 J a) Calculate the efficiency of the cycle. b) If the initial temperature in step 1 is 25°C, what is the temperature at the end of step 2. c) If the number of moles of ideal gas involved in the cycle is 0.1 mol; calculate ΔH for step 4

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