Aheat pump is used to maintain a house at 25c by extracting heat from the outside air on a day when the outside air temperature is 4c. the house is estimated to lose heat at a rate of 110,000 kj/h, and the heat pump consumes 4.75 kw of electric power when running. is this heat pump powerful enough to do the job?

Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?