Question 4 of 10 A student measures the time it takes for two reactions to be completed. Reaction A is completed in 12 seconds, and reaction B is completed in 21 seconds. What can you conclude about the rates of these reactions? O A. The rate of reaction B is lower. OB. The rate of reaction A is lower. C. The rates of reactions A and B are equal. SUBMIT​

Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)