What is EL Niño?
A. When the Eastern Pacific Ocean is coon than normal and causes climate changes.

B. When the Eastern Pacific Ocean is warmer than normal and causes more storms.

C. When the Atlantic Ocean is colder than normal and no weather changes.

D. When the Atlantic Ocean is warmer than normal and causes drought.

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?