A rigid tank with a volume of .03 m3 is evaluated to a low pressure and then place into a low temperature bath at 244k. .05 of pure solid water is introduced into the tank. At 244k, the entropy change between saturated water vapor and ice is 11.62 j/g. k and the vapor pressure of ice is 42.8 N/m2 .calculate u and Q

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?