Every input will end in a newline, and every response must end in a newline. INSERT KEY inserts key key into the door. Response should be: KEY INSERTED BY TURN KEY turns the key in the door. Possible responses are: SUCCESS TURNS KEY or FAILURE UNABLE TO TURN KEY

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?