An environmental chemist sampling industrial exhaust gases from a coal-burning plant collects a CO₂SO₂H₂O mixture in a 21.0L steel tank until the pressure reaches 921.0 torr at 44.0C.

(a) How many moles of gas are collected?

mol gas=?

(b) If the SO₂ concentration in the mixture is 4.39 10³ parts per million by volume (ppmv), what is its partial pressure? [Hint: ppmv = (volume of component/volume of mixture) 10⁶.]

torr=?