As a human resources professional for a large company, tommy is involved with the process. his goal is to find the right number of qualified people at the right time. he will screen a qualified pool of candidates and send these individuals forward to others in the firm who will make the final selection decision.

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?