In which sealed container would the organisms be able to continuously cycle O2 and CO2 gases?
O
A. A terrarium with a frog and a pool of water
O
B. An aquarium with water plants and a snail
O
C. A terrarium with mice and wood shavings
O
D. An aquarium with fish and plastic plants

Refrigerant-134a flows through a carnot heat pump cycle at 0.5 kg/s. it is known that the maximum absolute temperature in the cycle is 1.1 times the minimum absolute temperature, and the net power input to the cycle is 2.5 kw. if the refrigerant changes from a saturated vapor to a saturated liquid during the heat rejection process, determine the maximum magnitude of the enthalpy of vaporization for this process in kj/kg (with 3 significant figures).