Your recovery/recycling machine has r-22 refrigerant in it. you now have to recover refrigerant from a unit with r-410a. what must be done before your recovery unit can be used to recovery r-410a?
a) the recovery unit must be epa certified for use with r-410a. b) the recovery tank must be designed for the pressure of r-410a. c) the filter and lubricant in the recovery unit must be changed, and the recovery unit evacuatedd) all of the above

The magnitude of the amount of energy released by burning a fuel source, measured in energy per unit mass, is called its fuel value. note that the fuel value is the negative of the isobaric specific heat of combustion for the fuel. if all the energy obtained from burning 1.23 pounds of butane with a fuel value of 10.85 kcal/g is used to heat 128.0 kg of water at an initial temperature of 18.3 °c, what is the final temperature? note that 1 lb = 453.6 g.