What is a material safety data sheet? A. a categorized list of hazardous substances in an industry B. a document with safety information about a single substance C. a list of substances allowed by law for a given purpose D. a list of materials considered safe in a certain temperature range

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?