Choose all of the correct statements concerning acids and bases. HCl will turn blue litmus paper red a pH of 2 is a stronger acid than a pH of 5 the pH of NaOH is around 3 a substance with a pH of 9 will turn blue litmus paper red acids release hydrogen ions in solution litmus paper can be used to test the strength of an acid or base

4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)