Question

The diving atmosphere used by the U.S. Navy in its undersea Sea-Lab experiments consisted of 0.036 mole fraction O2 and 0.058 mole fraction N2, with helium (He) making up the remainder. What are the masses of nitrogen, oxygen, and helium in a 7.22-g sample of this atmosphere?

Answer 1

multipy the mole fraction by molmass of each gass. Total them up.

divide each by the total, to give a weighted fraction.

Nitrogen mass calc= molefraction*MolmassN2

then do that for all three, to get total.

massnitrogen= (nitrogenmasscalc)/total * 7.22g