<prompt> Following data was obtained from a 20 year old medical student: tidal volume 540 mL, paial pressures of CO2 in expired air aerial blood PECO2 20 mm Hg, PACO2 30 mm Hg: respiratory rate 15min. The alveolar ventilation would be:-4.2 Lmin4.8 Lmin5.2 Lmin5.4 Lmin  <response>: Alveolar ventilation tidal volume - dead space volume x Respiratory rate 540 - 180 115 5.4 Lmin 