Which contains less oxygen : inhaled air or exhaled air ?

An athelet takes 20 breaths per minute at room temperature. The air inhaled in each breath is 200mL which contains 20% oxygen by volume, while exhaled air contains 10% oxygen by volume. Assuming that al the oxygen consumed if used for converting glucose into CO_(2) and H_92)O_((l)) , how much glucose will be burnt in the body in one hour and what is the heat produced ? ( Room temperature -27^(@)C and enthalpy of combustion of glucose is -2822.5kJ mol^(-1) at 0^(@)C)

(a) Give the main points of difference between respiration in plants and respiration in animals (b) Describe the exchange of gases which takes place in the leaves of plant (a) during daytime, and (b) at night. (c) Which contains more carbon dixoide: exhaled air or inhaled air? Why?

Oxygen in expired air

In a basal metabolism measurements timed at 6.0 minute a patient exhaled 52.5 litre of air measured over water at 20^(@)C The vapour pressure of water at 20^(@)C is 17.5 torr The barometric pressure was 750 torr. The exhaled air analysed 16.75 volume per cent of oxygen both on a dry basis Neglecting any solubility f the gases in water and any difference in the total volume of inhaled and exhaled air, calculate rate of oxygen consumption by the patient in mL (STP) per minute

A person takes 15 breaths per minute. The volume of air inhaled in each breath is 448 ml and contains 21% of oxygen by volume. The exhaled air contains 16% of oxygen by volume. If all the oxygen is used in the combustion of sucrose, how much of the Sucrose is burnt in the body per day & how much heat is evolved. Delta H_(com) of sucrose is = 6000 kJ mol^(-1) . Take temperature to be 300 K throughout. [Assuming V_("inhaled air") = V_("exhalded air"), P_(atm) = 1atm ]

Tidal volume is that volume of air which is inhaled (and exhaled) in one breath by a human during quiet breathing. For a normal man this volume is close to 0.6 litre. 35% of oxygen (in terms of molecular count) gets converted into carbon – di – oxide in the exhaled air. Nearly 21% of the air that we breath in is oxygen. Assume that a man is breathing when the air is at STP and the moisture content of inhaled and exhaled air is same. Estimate the difference in mass of an inhaled breath and exhaled breath.

Assertion : Most fish when out of water, die of suffocation. Reason : Atmospheric air contains far less oxygen content than the dissolved oxygen in water.