A 118-mm application of water measured at the pump increased the average water content of the top 0.9 m of the soil from 0.15 to 0.20 (dry-weight basis). If the average dry bulk density of the soil is 1400 kg/m3, what is the water application efficiency, to the nearest percent

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?